dup() the jobserver fds to 100,101 to make debugging a bit easier.
dup() the jobserver fds to 100,101 to make debugging a bit easier.

Now if a process is stuck waiting on one of those fds, it'll be obvious from
the strace.

dinkelk/redo-python,dinkelk/redo-python,rowhit/redo,pombredanne/redo,dinkelk/redo-python,pombredanne/redo,pombredanne/redo,rowhit/redo,apenwarr/redo,dinkelk/redo-python,apenwarr/redo,apenwarr/redo,pombredanne/redo,rowhit/redo,apenwarr/redo,rowhit/redo