VS: fix "C1083: Cannot open compiler generated file" error with...

VS: fix "C1083: Cannot open compiler generated file" error with polymost1Frag.glsl.cpp and polymost1Vert.glsl.cpp

I'm not entirely happy with this due to the addition of the extra filter in the IDE to hold the generated files, but it's better than having to hit build twice in order to get a successful compilation.

platform/Windows/build.vcxproj.filters

@@ -12,6 +12,9 @@
     <Filter Include="Header Files\miniz">
       <UniqueIdentifier>{14fcfbb9-d8a5-4e68-8cac-f8d8d2c2b7da}</UniqueIdentifier>
     </Filter>
+    <Filter Include="Source Files\Generated">
+      <UniqueIdentifier>{2d7bd170-46ef-4c43-ace0-20a97ca15f4c}</UniqueIdentifier>
+    </Filter>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\..\source\build\src\2d.cpp">
@@ -209,6 +212,12 @@
     <ClCompile Include="..\..\source\build\src\xxh_x86dispatch.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="$(IntermediateOutputPath)\polymost1Frag.glsl.cpp">
+      <Filter>Source Files\Generated</Filter>
+    </ClCompile>
+    <ClCompile Include="$(IntermediateOutputPath)\polymost1Vert.glsl.cpp">
+      <Filter>Source Files\Generated</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\source\build\include\a.h">

platform/Windows/eduke32.sln

-
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.28803.202