Use a single marshal file for entire project

src/common/common.vcxproj.filters

@@ -110,6 +110,9 @@
     <ClInclude Include="typedef.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="marshal.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="cfgfiles.c">
@@ -187,5 +190,11 @@
     <ClCompile Include="hexchat.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="marshal.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\..\config-win32.h.tt" />
   </ItemGroup>
 </Project>