Add validation.h to Headers filter

Author: mrotteveel

builds/win32/msvc15/engine_static.vcxproj

@@ -387,6 +387,7 @@
     <ClInclude Include="..\..\..\src\jrd\types.h" />
     <ClInclude Include="..\..\..\src\jrd\UserManagement.h" />
     <ClInclude Include="..\..\..\src\jrd\val.h" />
+    <ClInclude Include="..\..\..\src\jrd\validation.h" />
     <ClInclude Include="..\..\..\src\jrd\val_proto.h" />
     <ClInclude Include="..\..\..\src\jrd\vio_debug.h" />
     <ClInclude Include="..\..\..\src\jrd\vio_proto.h" />

builds/win32/msvc15/engine_static.vcxproj.filters

@@ -1137,6 +1137,9 @@
     <ClInclude Include="..\..\..\src\jrd\replication\Utils.h">
       <Filter>Replication\Headers</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\src\jrd\validation.h">
+      <Filter>Header files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\..\src\dsql\DdlNodes.epp">