Bazel outputs isysroot /foo/bar as a single arg, handle it
Bazel outputs isysroot /foo/bar as a single arg, handle it

Summary:
Bazel is in the process of fixing this, so this should be a short lived
hack.

The problem is that when we pass the arguments to clang, it doesn't
interpret "-isysroot /foo/bar" correctly, which leads to an invalid
syspath, which causes the extractor to fail.

Reviewers: zarko

Reviewed By: zarko

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1483

benjyw/kythe,benjyw/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,benjyw/kythe,legrosbuffle/kythe,legrosbuffle/kythe,bzz/kythe,kythe/kythe,kythe/kythe,benjyw/kythe,kythe/kythe,kythe/kythe,legrosbuffle/kythe,kythe/kythe,kythe/kythe,kythe/kythe,legrosbuffle/kythe,kythe/kythe,legrosbuffle/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,legrosbuffle/kythe,kythe/kythe,benjyw/kythe,benjyw/kythe,benjyw/kythe,bzz/kythe,bzz/kythe,kythe/kythe,bzz/kythe,bzz/kythe,bzz/kythe,bzz/kythe,legrosbuffle/kythe,benjyw/kythe,bzz/kythe,benjyw/kythe,bzz/kythe,legrosbuffle/kythe,legrosbuffle/kythe,bzz/kythe,kythe/kythe,benjyw/kythe