New compressed formats were introduced
in Open GL ES 3.0 and these have to be
checked for properly.

Change-Id: I88c5c7478e5358c22b4ffce8939d1adb926ce9df
Reviewed-on: https://swiftshader-review.googlesource.com/3017Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>