TRAC #11339

* glCompressedTexImage2D and glCompressedTexSubImage2D verify
parameters and then fail with GL_INVALID_ENUM since there are no supported formats.
* glGetIntegerv recognises GL_NUM_COMPRESSED_TEXTURE_FORMATS
(returns 0) and GL_COMPRESSED_TEXTURE_FORMATS (returns none).

Signed-off-by: Nicolas Capens
Signed-off-by: Daniel Koch

Original-Author:    Andrew Lewycky <andrew.lewycky@transgaming.com>

git-svn-id: https://angleproject.googlecode.com/svn/trunk@19 736b8ea6-26fd-11df-bfd4-992fa37f6226