This will be used by the Flatpak build, to offload per-locale data to a Locale
extension (which expects all per-locale files to be in one place, so we need to
add---potentially dangling, if a given locale is not installed---symlinks from
the original places to the location where that Locale extension stores the
actual files).

Change-Id: Id13b8c53fbc9e0763e53fd09c0c059c9e638c13d
Reviewed-on: https://gerrit.libreoffice.org/52381Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>