Merge branch 'ml/windows-tie-loose-ends'
* ml/windows-tie-loose-ends:
git-gui: use /cmd/git-gui.exe for shortcut
git-gui: Windows tk_getSaveFile is not useful for shortcuts
git-gui: let nice work on Windows
git-gui: do not add directories to PATH on Windows
Signed-off-by: Johannes Sixt <j6t@kdbg.org>