winebuild: Also optimize out imports that are only used for forwards.

tools/winebuild/import.c

@@ -617,9 +617,10 @@ int resolve_imports( DLLSPEC *spec )
                 }
             }
         }
-        if (!removed && check_unused( imp, spec ))
+        if (!removed)
         {
             /* the dll is not used, get rid of it */
+            if (check_unused( imp, spec ))
                 warning( "winebuild: %s imported but no symbols used\n", imp->spec->file_name );
             remove_import_dll( i );
             i--;