Don't output debugdir for WinRT builds, since it messes up the emulator.

scripts/genie.lua

@@ -70,7 +70,10 @@ function exampleProject(_name)
 
 	configuration {}
 
-	debugdir (BGFX_DIR .. "examples/runtime/")
+	-- don't output debugdir for winphone builds
+	if "winphone8-1" ~= _OPTIONS["vs"] then
+		debugdir (BGFX_DIR .. "examples/runtime/")
+	end
 
 	includedirs {
 		BX_DIR .. "include",