OpenGL CTS 4.6.0.3
Fixes:
* move robust_buffer_access_behavior tests to NoContext group
* Fix some egl robustness tests
* Update KC CTS
* Fix broken layout binding tests
* Fix more expected errors for some DSA functions
* glspirv: don't cause aborted test runs.
* Fix pipeline statistics test
* use correct delete function for arrays
* Fix epsilon calculation for RGB10_A2 pixel format
* Fixes pixelformat utils for RGB10_A2
* Add specific RGB10A2 data for BlendHSLHue and BlendHSLSaturation
* Explicitly use -A Win32 platform in CMake Visual Studio 2019 builds
* Add support for building with Visual Studio 2019
* Handle gcc 7 warnings
* Fix GCC 7 implicit fallthrough warnings
* Add glu::BufferOffsetAsPointer utility
* Fix expected errors for some DSA functions
* Use maximum conformant sample count configuration
* Fix build when .git is a gitlink file
* gl4cComputeShaderTests: correct conversion
* x11_egl: use correct cmake variable name for GLES1 include path
* GL_ARB_enhanced_layouts: use separable programs
* GL_ARB_enhanced_layouts: no structs as VS inputs
* GL_ARB_enhanced_layouts: remove dead code
* GL_ARB_enhanced_layouts: fix interstage interfaces
* GL_ARB_enhanced_layouts: use centroid and sample
* GL_ARB_enhanced_layouts: mind double types
* GL_ARB_enhanced_layouts: use component 0 for mat
* GL_ARB_enhanced_layouts: mind aliasing bit width
* Fix context creation in robust_buffer_access_behavior test
* GL_ARB_enhanced_layouts: fix arrays in {G,TC,TE}S
* GL_ARB_enhanced_layouts: no static use of inputs
* GL_ARB_enhanced_layouts: add missing out varyings
* GL_ARB_enhanced_layouts: correct usage of "flat"
* GL_ARB_enhanced_layouts: no def in untested stage
* Create context with CONTEXT_ROBUST for robust buffer access tests
* Fix deleting texture in DSA test
* Fix GL errors expected for glClearNamedBufferData and glClearNamedBufferSubData
* Terminate EGL display after use