Fix the compile errors for mesa on Android

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=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=152502

[yongsheng, 2012-08-20 05:24:23]

I'm afraid mesa won't be upgraded soon so that I pick up these patches from mesa
upstream for chromium. To enable gpu_tests on Android, the first step is to
remove these errors.

[yongsheng, 2012-08-20 06:08:42]

+Sami, the webgl tests reporter on crbug.com

[Sami, 2012-08-20 09:50:50]

lgtm

[yongsheng, 2012-08-20 09:52:57]

On 2012/08/20 09:50:50, Sami wrote:
> lgtm
thanks, I'll try to enable gpu_tests on Android. This is the first step.
Now let us wait for kbr's comments. Thanks.

[Ken Russell (switch to Gerrit), 2012-08-20 19:53:07]

lgtm

[yongsheng, 2012-08-21 01:20:11]

On 2012/08/20 19:53:07, kbr wrote:
> lgtm
thanks for you two.

[commit-bot: I haz the power, 2012-08-21 01:27:49]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/yongsheng.zhu@intel.com/10825442/1

[commit-bot: I haz the power, 2012-08-21 04:35:23]

Change committed as 152502