Native bindings to the EXT_sRGB_write_control extension.

This extension's intent is to expose new functionality which allows an application the ability to decide if the conversion from linear space to sRGB is necessary by enabling or disabling this conversion at framebuffer write or blending time. An application which passes non-linear vector data to a shader may not want the color conversion occurring, and by disabling conversion the application can be simplified, sometimes in very significant and more optimal ways.

Requires GLES 2.0 and EXT_sRGB or GLES 3.0.