Disable OpenCL by default for LO Flatpak

...merging <https://github.com/flathub/org.libreoffice.LibreOffice/commit/
2c72c8b2c9beb4995c5a57b4eedf05f6c7ff248d> "Disable OpenCL by default for LO
Flatpak":

"This fixes <https://github.com/flathub/org.libreoffice.LibreOffice/issues/82>
'LibreOffice cannot be launched with flatpak in normal mode on ASUS E402YA',
where LO was found hanging (for as yet unclear exact reasons) on one machine
when OpenCL was enabled.  There have been other issues with OpenCL like
<https://bugzilla.redhat.com/show_bug.cgi?id=1432468> 'LibreOffice crashes on
startup' on Fedora, so for a Flatpak build targeting a wide range of distros,
the conservative approach is probably to disable OpenCL by default and have
users explicitly enable it instead."

Change-Id: I887137d1ceb5d97f007f09cba636c59f197f1bff
Reviewed-on: https://gerrit.libreoffice.org/70928
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

solenv/flatpak-manifest.in

@@ -574,7 +574,8 @@
                 "./autogen.sh --prefix=/run/build/libreoffice/inst --with-distro=LibreOfficeFlatpak",
                 "make $(if test \"$FLATPAK_ARCH\" = i386; then printf build-nocheck; fi)",
                 "make distro-pack-install",
-                "make cmd cmd='$(SRCDIR)/solenv/bin/assemble-flatpak.sh'"
+                "make cmd cmd='$(SRCDIR)/solenv/bin/assemble-flatpak.sh'",
+                "printf '<?xml version=\"1.0\"?>\\n<oor:data xmlns:xs=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:oor=\"http://openoffice.org/2001/registry\"><dependency file=\"main\"/><oor:component-data oor:name=\"Common\" oor:package=\"org.openoffice.Office\"><node oor:name=\"Misc\"><prop oor:name=\"UseOpenCL\"><value>false</value></prop></node></oor:component-data></oor:data>' >/app/libreoffice/share/registry/flatpak.xcd"
             ]
         }
     ],