Partially revert "svx, canvas, desktop: gb_OBJCXXFLAGS are not needed at all"

This reverts commit 601d7d38.

desktop and svx need these flags in case of OS X sandboxing

Change-Id: Ib811aa53bc2d71839961cdcea0dd4836ebdbc38c
(cherry picked from commit 57117cf5)
Reviewed-on: https://gerrit.libreoffice.org/16572Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

desktop/Library_sofficeapp.mk

@@ -63,12 +63,22 @@ $(eval $(call gb_Library_use_libraries,sofficeapp,\
 
 ifeq ($(OS),MACOSX)
 
+$(eval $(call gb_Library_add_cxxflags,sofficeapp,\
+    $(gb_OBJCXXFLAGS) \
+))
+
 $(eval $(call gb_Library_use_system_darwin_frameworks,sofficeapp,\
     Foundation \
 ))
 
 endif
 
+ifeq ($(OS),IOS)
+$(eval $(call gb_Library_add_cflags,sofficeapp,\
+    $(gb_OBJCFLAGS) \
+))
+endif
+
 $(eval $(call gb_Library_add_exception_objects,sofficeapp,\
     desktop/source/app/app \
     desktop/source/app/appinit \

svx/Library_svxcore.mk

@@ -91,6 +91,10 @@ $(eval $(call gb_Library_use_externals,svxcore,\
 
 ifeq ($(OS),MACOSX)
 
+$(eval $(call gb_Library_add_cxxflags,svxcore,\
+    $(gb_OBJCXXFLAGS) \
+))
+
 $(eval $(call gb_Library_use_system_darwin_frameworks,svxcore,\
 	Foundation \
 ))