Clang update.py: clobber more CMake cache files
Clang update.py: clobber more CMake cache files

The compiler info seems to get cached under CMakeFiles/3.2.2/CompilerId*.
To clobber things properly, let's nuke any CmakeFiles dirs.

BUG=594361
R=thakis@chromium.org
TBR=thakis

Review URL: https://codereview.chromium.org/1794333003 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#380953}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk