implement support for scheduling local non-compile jobs.

For example: you can add a symlink named "meinproc4" pointing to icecc to your path, and it will automatically schedule the job and then invoke meinproc4 on it locally.

the advantage is that you can use cmake -j50 without having to worry that there are going to be 50 meinproc jobs killing your machine.

same could be done for moc, btw.