buildbot for m4 latest git version

[Bob Proulx]

Jim Meyering asked if I would add a git source buildbot for m4 beside
the one running for coreutils.  I've done that and it is available
here building for 32-bit and 64-bit GNU/Linux.

  http://buildbot.proulx.com:9004/

And one for autoconf here:

  http://buildbot.proulx.com:9003/

A quick links page:

  http://www.proulx.com/sys/build-daemons/

Bob