CMake: fixed issue with DILIGENT_CORE_COMMIT_HASH using the source tree root instead of the core module directory (fix DiligentGraphics/DiligentTools#187)
CMake: fixed issue with DILIGENT_CORE_COMMIT_HASH using the source tree root instead of the core module directory (fix DiligentGraphics/DiligentTools#187)

DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore,DiligentGraphics/DiligentCore