GDK: Handle ProjectDir with space

The call to compile_shaders_xbox.bat fails if ProjectDir contains a space. Wrapping the command in quotes fixes the issue.

(cherry picked from commit 14ae45c2b8de253825677083eb2ba7b63a5c6151)

VisualC-GDK/SDL/SDL.vcxproj

@@ -168,8 +168,8 @@
     </Link>
     <PreBuildEvent>
       <Command>
-        call $(ProjectDir)..\..\src\render\direct3d12\compile_shaders_xbox.bat $(ProjectDir)..\
-        call $(ProjectDir)..\..\src\gpu\d3d12\compile_shaders_xbox.bat $(ProjectDir)..\
+        call "$(ProjectDir)..\..\src\render\direct3d12\compile_shaders_xbox.bat" "$(ProjectDir)..\"
+        call "$(ProjectDir)..\..\src\gpu\d3d12\compile_shaders_xbox.bat" "$(ProjectDir)..\"
       </Command>
     </PreBuildEvent>
     <PreBuildEvent>