Revision 535260

devel/vulkan-*: update to 1.2.135.0

Changes:	https://github.com/KhronosGroup/glslang/compare/7.11.3214...8.13.3743
Changes:	https://github.com/KhronosGroup/SPIRV-Headers/compare/1.4.1...1.5.3
Changes:	https://github.com/KhronosGroup/SPIRV-Tools/compare/v2019.3...v2020.2
Changes:	https://github.com/google/shaderc/compare/v2018.0...v2020.0
Changes:	https://github.com/KhronosGroup/Vulkan-Headers/compare/sdk-1.1.108.0...sdk-1.2.135.0
Changes:	https://github.com/KhronosGroup/Vulkan-Loader/compare/sdk-1.1.108.0...sdk-1.2.135.0
Changes:	https://github.com/KhronosGroup/Vulkan-Tools/compare/sdk-1.1.108.0...sdk-1.2.135.0
Changes:	https://github.com/KhronosGroup/Vulkan-ValidationLayers/compare/sdk-1.1.108.0...sdk-1.2.135.0
PR:		242775
Submitted by:	Austin Shafer <ashafer@badland.io>
Approved by:	Greg V <greg@unrelenting.technology> (maintainer)