build: Rebuild .pot file on source changes

Add a few dependencies for regenerating the .pot file.
1 job for wip/hadess/no-acronym-translation in 2 minutes and 40 seconds (queued for 22 seconds)
Status Job ID Name Coverage
  Test
failed #592614
build

00:02:40

 
Name Stage Failure
failed
build Test
  CC       test_tree_magic-test-tree-magic.o
CCLD test-tree-magic
make -C po update-gmo
GEN freedesktop.org.xml
make[2]: Leaving directory '/builds/xdg/_build'
make[1]: Leaving directory '/builds/xdg/_build'
$ make check
make: *** No rule to make target '*/*.po', needed by 'po/shared-mime-info.pot'. Stop.
ERROR: Job failed: exit code 1