Fix linkify for relative paths pointing outside the buildroot
Review Request #3441 - Created Feb. 9, 2016 and submitted
|benjyw, gmalmquist, molsen, patricklaw|
Linkify was failing for relative paths to directories outside the buildroot. This happens in particular when the workdir is located outside the buildroot at, for example,
- Since BUILD files definitely cannot live outside the buildroot, don't attempt a lookup.