Call willLintPath() hook from PhutilLinter

Summary:
Some callpaths end up here, which doesn't cause the internal linter's willLintPath() method. This can mean its `activePath` is set wrong, which results in us raising lint for the wrong file.

Particularly, if you apply D7979 (diff 18069) and `arc lint` it, you'll get a syntax error message in the wrong file.

Test Plan: Applied D7979 and linted it, got proper error message.

Reviewers: btrahan

Reviewed By: btrahan

CC: aarwine, aran

Differential Revision: https://secure.phabricator.com/D7988
Fix exception on diff parse on FreeBSD

FreeBSD 9.2 comes with diff tool version 2.8.7 which behaves
a bit different from how it is expected to. Namely for diff
between two binary files it says:

  Files A and B are differ

This was leading to an exception when browsing revisions with
changes in binary files.

Tweaked parse patterns in order to fix this issue. Now both
older and newer diff tools are supported.

See: <https://github.com/facebook/arcanist/pull/139>

Reviewed by: epriestley
Merge branch 'master' of http://github.com/facebook/arcanist