FS-6293 fix windows build from version.h being added to xmlrpc

libs/win32/xmlrpc-c/xmlparse.2012.vcxproj

@@ -235,7 +235,7 @@ popd
       <SuppressStartupBanner>true</SuppressStartupBanner>
     </Bscmake>
     <PreBuildEvent>
-      <Command>if not exist "$(XMLRPCDir)version.h" (
+      <Command>if not exist "$(XMLRPCDir)xmlrpc_config.h" (
 pushd $(XMLRPCDir)Windows
 "ConfigureWin32.bat"
 popd