Update clang_linux to version 4

Bug: skia:
Change-Id: Iab4fcd7b8f17fa7bf478e879a325759e0c622b1a
Reviewed-on: https://skia-review.googlesource.com/13120
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
6 files changed