CMake: Windows: Use release libs of shaderc for debug builds.

While shaderc is a c++ library that normally requires debug libs
for ABI reasons, shaderc only exports a C interface, so it will
link release mode libs just fine even for debug builds.

This drops the time required for GPU_shader_compile_static in a
debug build from 5 mins to 3 sec for @pragma37

no changes for release configurations.

build_files/cmake/platform/platform_win32.cmake

@@ -1312,8 +1312,7 @@ if(WITH_VULKAN_BACKEND)
     set(SHADERC_INCLUDE_DIR ${SHADERC_ROOT_DIR}/include)
     set(SHADERC_INCLUDE_DIRS ${SHADERC_INCLUDE_DIR})
     set(SHADERC_LIBRARY
-      DEBUG ${SHADERC_ROOT_DIR}/lib/shaderc_shared_d.lib
-      OPTIMIZED ${SHADERC_ROOT_DIR}/lib/shaderc_shared.lib
+      ${SHADERC_ROOT_DIR}/lib/shaderc_shared.lib
     )
     set(SHADERC_LIBRARIES ${SHADERC_LIBRARY})
   else()