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>