cvs: 1.12.13

The reason to go through the effort of including this in the dupe directory? Xcode 5 Developer Preview no longer has `cvs` included.

This is pretty much a verbatim copy of what you'd get from Xcode 4, using the same patches and configure arguments from http://www.opensource.apple.com/

I discovered `ENV.j1` due to weird, strange installation failures if I didn't have it. So, since this is an ANCIENT piece of code, I'm just going to let that be, and never try to figure out why it doesn't parallelize properly.

I thought I'd include in homebrew-dupes for now, since Xcode 5 is still a Developer Preview. Perhaps later it can be migrated to homebrew if desired.