ext_texture_format_bgra8888: changes for effective internal format

OpenGL ES 3.0+ introduces concept of 'effective internal format' where the internal format is constructed from given type and format and driver should behave as if the effective internal format was used as internal format when specifying the texture data.

Patch changes the test to run "format vs internal format" checks only on ES version <3.0 where where effective internal format does not exist.

Signed-off-by: Tapani Pälli tapani.palli@intel.com