Fix the compile errors for mesa on Android

There are some compile errors for mesa when trying to build gpu_tests
on Android. They were fixed in the mesa upstream.
So this patch combines 3 commits from mesa upstream. They are:
1) Commit eb0ff1a1c0 by chad@chad-versace.us: remove the use of
fpu_control.h
2) Commit 504f92c739 by olvaffe@gmail.com: android has no log2f
nor ffs
3) Commit 497baf4e4a by ian.d.romanick@intel.com: Use C-style
system headers in C++ code to avoid issues with std:: namespace

BUG=138226
TEST=


Review URL: https://chromiumcodereview.appspot.com/10825442

git-svn-id: svn://svn.chromium.org/chrome/trunk/src/third_party/mesa/MesaLib@152502 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed