Fix reporting of DXC errors in test app
Fix reporting of DXC errors in test app

Fallback to compiling without -Qembed_debug if it fails, to support
older Windows 10 SDKs

baldurk/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc