[PATCH] Fix the build for git repositories with multiple remotes.

[Jordan Rose]

  The handling of the output treats it like a single URL. I'd prefer the first remote since the idea is to tell where you are relative to everyone else, and since the GetSourceVersion script only checks the SVN commit number the remote is what's relevant.

  We could also change GetRepositoryPath to prefer the tracking branch's remote before falling back to the general list.

http://llvm-reviews.chandlerc.com/D1659