Because recent Git for Windows do come with a real msgfmt, the
build procedure for git-gui has been updated to use it instead of a
hand-rolled substitute.
* js/git-gui-msgfmt-on-windows:
git-gui (MinGW): make use of MSys2's msgfmt
git gui: allow for a long recentrepo list
git gui: de-dup selected repo from recentrepo history
git gui: cope with duplicates in _get_recentrepo
git-gui: remove duplicate entries from .gitconfig's gui.recentrepo