Merge in Flatpak improvements

...from <https://github.com/flathub/org.libreoffice.LibreOffice/>:

commit 7a2393f5fcab8c6938180c4718f2c61acd495528
Author: Robert McQueen <rob@endlessm.com>
Date:   Tue Apr 3 10:41:22 2018 +0100

    port to freedesktop.org 1.6 runtime

    Gtk+3/GIO/etc dependencies used by LO in "GNOME" mode are actually
    included in the freedesktop.org runtime. Try to build against fd.o
    by downgrading gst-libav (fd.o has gst 1.10 rather than gnome's 1.12),
    bundling dbus-glib and disable Gtk+ 2.

commit 42650da01f270e86bfb40035a9194b23ccf24c4c
Author: Robert McQueen <rob@endlessm.com>
Date:   Tue Apr 3 11:23:27 2018 +0100

    fix up LD_LIBRARY_PATH with gcc7

    Append to library path rather than resetting it (causes build failures
    due to overriding /app/lib).

commit 3e4c655294c8124cb54e1c651ec4dc1230b8151e
Author: Robert McQueen <rob@endlessm.com>
Date:   Tue Apr 3 11:25:02 2018 +0100

    fixup solenv/bin/assemble_flatpak.sh

    Use mkdir -p to be robust to other modules (ie dbus-glib) creating
    some of the paths before we do.

commit d1d449ffa837b1de876f524494dbce09ec92ce73
Author: Robert McQueen <rob@endlessm.com>
Date:   Wed Apr 4 15:50:49 2018 +0100

    split resource/registry data into Locales extension

    Move the language-specific data into the /app/share/runtime path which
    flatpak-builder splits into the Locale extension if we re-enable
    separate-locales. We symlink the original locations back to these paths, which
    means we have dangling symlinks depending on which Locale sutpaths are
    installed.

    Include Stephan Bergmann's patch from https://gerrit.libreoffice.org/#/c/52381/
    to make the configmgr robust to such dangling links.

commit ad6674f166c68fb79e19d80950a104a0a33f81dc
Author: Robert McQueen <rob@endlessm.com>
Date:   Wed Apr 4 16:05:28 2018 +0100

    make locale split glob more specific

    This loop will fail if the share/registry/res folder gains any .xcd
    files which are not named fcfg_langpack_* or registry_* so just to
    be safe, only glob these files.

Change-Id: Icd41d7077b9f308dbb196927715b210328709662
Reviewed-on: https://gerrit.libreoffice.org/52642Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

distro-configs/LibreOfficeFlatpak.conf

+--disable-gtk
 --disable-odk
 --enable-release-build
 --enable-symbols

solenv/bin/assemble-flatpak.sh

@@ -16,8 +16,7 @@ set -e
 cp -r "${PREFIXDIR?}"/lib/libreoffice /app/
 
 ## libreoffice-*.desktop -> org.libreoffice.LibreOffice-*.desktop:
-mkdir /app/share
-mkdir /app/share/applications
+mkdir -p /app/share/applications
 for i in "${PREFIXDIR?}"/share/applications/libreoffice-*.desktop
 do
  sed -e 's,^Exec=libreoffice,Exec=/app/libreoffice/program/soffice,' \
@@ -29,7 +28,7 @@ mv /app/share/applications/org.libreoffice.LibreOffice-startcenter.desktop \
 
 ## icons/hicolor/*/apps/libreoffice-* ->
 ## icons/hicolor/*/apps/org.libreoffice.LibreOffice-*:
-mkdir /app/share/icons
+mkdir -p /app/share/icons
 for i in "${PREFIXDIR?}"/share/icons/hicolor/*/apps/libreoffice-*
 do
  mkdir -p \
@@ -38,11 +37,39 @@ do
   "$(dirname /app/share/icons/hicolor/"${i#"${PREFIXDIR?}"/share/icons/hicolor/}")"/org.libreoffice.LibreOffice-"${i##*/apps/libreoffice-}"
 done
 
+mkdir -p /app/share/runtime/locale
+for i in $(ls /app/libreoffice/program/resource)
+do
+  lang="${i%[_@]*}"
+  mkdir -p /app/share/runtime/locale/"${lang}"/resource
+  mv /app/libreoffice/program/resource/"${i}" /app/share/runtime/locale/"${lang}"/resource
+  ln -s ../../../share/runtime/locale/"${lang}"/resource/"${i}" /app/libreoffice/program/resource
+done
+
+for i in /app/libreoffice/share/registry/Langpack-*.xcd /app/libreoffice/share/registry/res/{fcfg_langpack,registry}_*.xcd
+do
+  basename="$(basename "${i}" .xcd)"
+  lang="${basename#Langpack-}"
+  lang="${lang#fcfg_langpack_}"
+  lang="${lang#registry_}"
+
+  # ship the base app with at least one Langpack/fcfg_langpack
+  if [ "${lang}" = "en-US" ]
+  then
+    continue
+  fi
+
+  lang="${lang%-*}"
+  mkdir -p /app/share/runtime/locale/"${lang}"/registry
+  mv "${i}" /app/share/runtime/locale/"${lang}"/registry
+  ln -rs /app/share/runtime/locale/"${lang}"/registry/"${basename}".xcd "${i}"
+done
+
 ## org.libreoffice.LibreOffice.appdata.xml is manually derived from the various
 ## inst/share/appdata/libreoffice-*.appdata.xml (at least recent GNOME Software
 ## doesn't show more than five screenshots anyway, so restrict to one each from
 ## the five libreoffice-*.appdata.xml: Writer, Calc, Impress, Draw, Base):
-mkdir /app/share/appdata
+mkdir -p /app/share/appdata
 cat <<EOF >/app/share/appdata/org.libreoffice.LibreOffice.appdata.xml
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">

solenv/flatpak-manifest.in

 {
     "id": "org.libreoffice.LibreOffice",
-    "runtime": "org.gnome.Platform",
-    "runtime-version": "3.26",
-    "sdk": "org.gnome.Sdk",
+    "runtime": "org.freedesktop.Platform",
+    "runtime-version": "1.6",
+    "sdk": "org.freedesktop.Sdk",
     "sdk-extensions": [
         "org.freedesktop.Sdk.Extension.gcc7",
         "org.freedesktop.Sdk.Extension.openjdk9"
     ],
     "build-options": {
+        "append-ld-library-path": "/usr/lib/sdk/gcc7/lib",
         "env": {
             "CC": "/usr/lib/sdk/gcc7/bin/gcc",
-            "CXX": "/usr/lib/sdk/gcc7/bin/g++",
-            "LD_LIBRARY_PATH": "/usr/lib/sdk/gcc7/lib"
+            "CXX": "/usr/lib/sdk/gcc7/bin/g++"
         }
     },
     "command": "/app/libreoffice/program/soffice",
-    "separate-locales": false,
     "modules": [
         {
             "name": "gcc7",
@@ -34,14 +33,28 @@
         },
         {
             "name": "gst-libav",
-            "buildsystem": "meson",
-            "builddir": true,
-            "config-opts": ["-Ddisable_gtkdoc=true"],
+            "config-opts": [ "--disable-gtk-doc", "--with-system-libav" ],
+            "cleanup": [ "*.la", "/share/gtk-doc" ],
+            "sources": [
+                {
+                    "type" : "archive",
+                    "url" : "https://gstreamer.freedesktop.org/src/gst-libav/gst-libav-1.10.5.tar.xz",
+                    "sha256" : "e4d2f315f478d47281fbfdfbd590a63d23704ca37911d7142d5992616f4b28d3"
+                }
+            ]
+        },
+        {
+            "name": "dbus-glib",
+            "cleanup": [ "*.la", "/bin", "/etc", "/include", "/libexec", "/share/gtk-doc", "/share/man" ],
+            "config-opts": [
+                "--disable-static",
+                "--disable-gtk-doc"
+            ],
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://gstreamer.freedesktop.org/src/gst-libav/gst-libav-1.12.4.tar.xz",
-                    "sha256": "2a56aa5d2d8cd912f2bce17f174713d2c417ca298f1f9c28ee66d4aa1e1d9e62"
+                    "url": "https://dbus.freedesktop.org/releases/dbus-glib/dbus-glib-0.108.tar.gz",
+                    "sha256": "9f340c7e2352e9cdf113893ca77ca9075d9f8d5e81476bf2bf361099383c602c"
                 }
             ]
         },