Optimized version of glesv2 hybris wrapper

With relatively minor changes the library size on device was dropped from 31.8kB into 19.8kB. In addition the size of each function dropped significantly,  http://pastebin.com/7zkuCvN3
Removed stdio include
Added to authors as specified in pull request comment
Removed comment
Merge pull request #175 from sharpneli/master

Optimized version of the glesv2.c