Add a head url to test the patch MC supplied for us to fix the
fork bombs when building the VFS Fish module. Add deps on the
usual Autotools apps for head. Add an environment variable for
`LIBTOOLIZE` so the build can find our `glibtoolize`. Add a call
to `autogen.sh` for building head. Add the patch that the devs
wrote for us. It works for me, but I didn't have the fork bombs.
This is mostly for testing, but it can be pulled if it works and
adjusted when mc-4.8.4 is released as noted in the comments.
May fix #8587