Regression fix : Revert #3776
Oops, typo.
Don't frameskip unthrottle in headless.

Could make graphic tests wrong or something.
Cut down on work in regcache init on x86.

Very tiny tiny optimization for games, but 8-10% optimization for tests.
Merge pull request #3833 from raven02/patch-16

Regression fix : Revert #3754
Merge pull request #3835 from unknownbrackets/headless

A couple more optimizations
USING_GLES2 platforms: Fix build and fix a warning on Android.
Fix stupid typo.
Merge pull request #3843 from thedax/fixMobileBuilds

USING_GLES2 platforms: Fix build and fix a warning on Android.