OpenGL ES CTS 3.2.6.1 Fixes: * Remove more tests due to GLSL ES 1.0/3.x differences * KHR-GLES31.core.constant_expressions.* add T&G tests to the test tree * Remove tests that check non-zero values for reservedMustBeZero on all APIs * Don't check color outcome for tests that expect undefined behaviour * Replace imageAtomicExchange with imageAtomicCompSwap in vertex shader * Unsized internalformats not valid GetInternalFormat