GCC warning.

--HG--
branch : develop

src/libs/vwidgets/warnings.pri

@@ -22,6 +22,11 @@ unix {
                 QMAKE_LFLAGS += -fsanitize=address
             }
         }
+
+        # -isystem key works only for headers. In some cases it's not enough. But we can't delete this warnings and
+        # want them in global list. Compromise decision delete them from local list.
+        QMAKE_CXXFLAGS -= \
+            -Wswitch-default
     }
 
     clang*{