Msys2: Sometimes outdated .gmo files from earlier build used
Seen with S3_0 msys2 snapshot build: Latest translation updates were not working in the build. We are supposedly making complete builds (i.e., start with an empty build dir), but the gettext stuff creates .gmo files to the source directory, and those are not cleared between builds. I suspect we can sometimes end up using .gmo from an earlier build.
It's somewhat likely that this is a regression introduced by #43891 - now not regenerating translation files early enough from the point of view of this ticket. That would mean this is a regression since 3.0.0 -> 3.0.1 blocker?
Apperently the 'make install' step in msys2 Makefile does not produce translation files at all, nor does it error if they are not available for installing. If they are not present, it just does not install them. I've not seen such problems on linux, with the 'make install' as the only step to take.
So, we will need to have update-po back before make install, to produce .gmo files. Maybe we can 'git checkout' po-files after it, to avoid #43891 ? Going to test that.