re-add support for KDE4 Qt+glib eventloop intergration

The necessary build stuff was apparently silently dropped during gbuild
conversion and never noticed.

Change-Id: Ib1f530b92618a9d4f11c54818e984f737abaa283

config_host/config_kde4.h.in

+/*
+Settings for KDE4 integration.
+*/
+
+#ifndef CONFIG_KDE4_H
+#define CONFIG_KDE4_H
+
+#undef KDE_HAVE_GLIB
+
+#endif

configure.ac

@@ -10278,9 +10278,13 @@ int main(int argc, char **argv) {
     CXXFLAGS=$save_CXXFLAGS
     AC_LANG_POP([C++])
 
-   # Glib is needed for properly handling Qt event loop with Qt's Glib integration enabled
+    # Glib is needed for properly handling Qt event loop with Qt's Glib integration enabled.
+    # Sets also KDE_GLIB_CFLAGS/KDE_GLIB_LIBS if successful.
     PKG_CHECK_MODULES(KDE_GLIB,[glib-2.0 >= 2.4],
-        [KDE_HAVE_GLIB=1],
+        [
+        KDE_HAVE_GLIB=1
+        AC_DEFINE(KDE_HAVE_GLIB,1)
+        ],
         AC_MSG_WARN([[No Glib found, KDE4 support will not integrate with Qt's Glib event loop support]]))
 fi
 AC_SUBST(KDE4_CFLAGS)
@@ -11722,6 +11726,7 @@ AC_CONFIG_FILES([config_host.mk Makefile lo.xcent instsetoo_native/util/openoffi
 AC_CONFIG_HEADERS([config_host/config_clang.h])
 AC_CONFIG_HEADERS([config_host/config_global.h])
 AC_CONFIG_HEADERS([config_host/config_graphite.h])
+AC_CONFIG_HEADERS([config_host/config_kde4.h])
 AC_CONFIG_HEADERS([config_host/config_mingw.h])
 AC_CONFIG_HEADERS([config_host/config_telepathy.h])
 AC_CONFIG_HEADERS([config_host/config_typesizes.h])

vcl/Library_vclplug_kde4.mk

@@ -63,6 +63,17 @@ $(eval $(call gb_Library_add_libs,vclplug_kde4,\
 	-lICE \
 ))
 
+ifneq ($(KDE_HAVE_GLIB),)
+$(eval $(call gb_Library_add_defs,vclplug_kde4,\
+    $(KDE_GLIB_CFLAGS) \
+))
+
+$(eval $(call gb_Library_add_libs,vclplug_kde4,\
+    $(KDE_GLIB_LIBS) \
+))
+endif
+
+
 $(eval $(call gb_Library_add_exception_objects,vclplug_kde4,\
     vcl/unx/kde4/KDEData \
 	vcl/unx/kde4/KDE4FilePicker \

vcl/unx/kde4/KDEXLib.cxx

@@ -44,6 +44,8 @@
 
 #include <stdio.h>
 
+#include <config_kde4.h>
+
 #if QT_VERSION >= QT_VERSION_CHECK( 4, 9, 0 )
 #define QT_UNIX_EVENT_LOOP_SUPPORT
 #ifdef KDE_HAVE_GLIB