git-gui: Don't offer my miga hack if its configuration file isn't present.
treec2f22068c5a7f0040fed8e120c7a1aac0ef3e682
-rw-r--r-- 36 .gitignore
-rwxr-xr-x 745 GIT-VERSION-GEN
-rw-r--r-- 1200 Makefile
-rw-r--r-- 1948 TODO
-rwxr-xr-x 91056 git-gui.sh