Inject version of the source package of gcc-12-cross in binary versions

This package builds binary packages with hardcoded versions based on the version of gcc-12, but any new build of gcc-12-cross doesn't increment version of binary packages. Thus, to avoid clashes we need to inject the version of gcc-12-cross in their versions.

See: https://bugs.debian.org/1085612

This is a backport of gcc-14-cross!4 (merged) for gcc-12-cross.

Signed-off-by: Dylan Aïssi dylan.aissi@collabora.com