Fix object filename conflicts in GDK project file

Author: castholm

VisualC-GDK/SDL/SDL.vcxproj

@@ -546,7 +546,9 @@
     <ClCompile Include="..\..\src\io\windows\SDL_asyncio_windows_ioring.c" />
     <ClCompile Include="..\..\src\main\generic\SDL_sysmain_callbacks.c" />
     <ClCompile Include="..\..\src\main\gdk\SDL_sysmain_runapp.cpp" />
-    <ClCompile Include="..\..\src\main\windows\SDL_sysmain_runapp.c" />
+    <ClCompile Include="..\..\src\main\windows\SDL_sysmain_runapp.c">
+      <ObjectFileName>$(IntDir)\src_main_windows_SDL_sysmain_runapp.obj</ObjectFileName>
+    </ClCompile>
     <ClCompile Include="..\..\src\main\SDL_main_callbacks.c" />
     <ClCompile Include="..\..\src\main\SDL_runapp.c" />
     <ClCompile Include="..\..\src\SDL_guid.c" />