gpgmepp,xmlsecurity: fix testODFEncryptedGPG() failure caused...

...by CppunitTest setting LD_LIBRARY_PATH to include instdir/program.

This causes the spawned gpg-agent to load instdir/program/libassuan.so.0
instead of /usr/... and fail with:

writev(2, [{iov_base="gpg-agent", iov_len=9}, {iov_base=": ",
 iov_len=2}, {iov_base="relocation error", iov_len=16}, {iov_base=": ",
 iov_len=2}, {iov_base="gpg-agent", iov_len=9}, {iov_base=": ",
 iov_len=2}, {iov_base="symbol assuan_sock_set_system_ho"...,
 iov_len=118}, {iov_base="", iov_len=0}, {iov_base="", iov_len=0},
 {iov_base="\n", iov_len=1}], 10) = 159

The failure happens in the libreoffice-6-0 branch on Fedora 27, whereas
the master branch doesn't fail because it has a newer version of
libassuan that happens to provide the required symbol.

Fix this by applying the patch that was added for ASAN in
d15f042a to clear LD_LIBRARY_PATH
always on Linux.

Change-Id: I6a5c7fdfdd32234f39a182581b03d79739880c11
Reviewed-on: https://gerrit.libreoffice.org/50056Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>
(cherry picked from commit 81e4be9c)
Reviewed-on: https://gerrit.libreoffice.org/50059Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

external/gpgmepp/UnpackedTarball_gpgmepp.mk

@@ -23,6 +23,6 @@ $(eval $(call gb_UnpackedTarball_add_patches,gpgmepp, \
     $(if $(filter MSC,$(COM)),external/gpgmepp/w32-fix-libtool.patch.1) \
     $(if $(filter MSC,$(COM)),external/gpgmepp/w32-add-initializer.patch.1) \
     external/gpgmepp/w32-build-fixes-2.patch \
-    $(if $(ENABLE_RUNTIME_OPTIMIZATIONS),,external/gpgmepp/asan.patch) \
+    $(if $(filter LINUX,$(OS)),external/gpgmepp/asan.patch) \
 ))
 # vim: set noet sw=4 ts=4:

xmlsecurity/CppunitTest_xmlsecurity_signing.mk

@@ -52,12 +52,11 @@ ifeq ($(ENABLE_PDFIMPORT),TRUE)
 $(eval $(call gb_CppunitTest_use_executable,xmlsecurity_signing,xpdfimport))
 endif
 
-ifeq ($(ENABLE_RUNTIME_OPTIMIZATIONS),)
+# reset the LD_LIBRARY_PATH for spawned GPG processes
 ifeq ($(OS),LINUX)
 $(call gb_CppunitTest_get_target,xmlsecurity_signing): \
     EXTRA_ENV_VARS := \
         LIBO_LD_PATH=$$LD_LIBRARY_PATH
 endif
-endif
 
 # vim: set noet sw=4 ts=4: