SPIRV-Tools generates extension header files into the the project's intermediate build directory. SpirvShader needs to include `OpenCLDebugInfo100.h`, so copy this out to a "clean room" include directory and add this directory to the vk_swiftshader INCLUDE_DIRECTORIES. All of this smell should go away once https://github.com/KhronosGroup/SPIRV-Headers/issues/137 is addressed. Bug: b/145351270 Change-Id: Ib9205e04d32e2d8e0a6516449ec9114a3ff6dd94 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40090Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Ben Clayton <bclayton@google.com>
