git-gui: add directory git-gui is located in to PATH (on Windows)
-rwxr-xr-x 1812 GIT-VERSION-GEN
-rw-r--r-- 9586 Makefile
-rwxr-xr-x 69004 git-gui.sh
drwxr-xr-x - lib
drwxr-xr-x - macosx
drwxr-xr-x - po