gl: Add support for glCompressedTexImage2D
@cap
Submitted by Julien Isorce Link to original bug (#723781)
Description
http://www.opengl.org/sdk/docs/man/xhtml/glCompressedTexImage2D.xml
http://software.intel.com/en-us/articles/android-texture-compression
Should first investigate if it has to be done in separate gldec/glenc elements or if it could be done in glupload directly.