...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>