Automated update

configure

@@ -4705,7 +4705,7 @@ fi
 
 if test "$GNU_CXX"; then
     # Turn on GNU specific features
-    _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wall -Wconversion -Wpointer-arith -Wcast-align -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy"
+    _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wall -Wconversion -Wpointer-arith -Wcast-align -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy -Wno-non-virtual-dtor"
 
     _DEFINES_CXXFLAGS='-DMOZILLA_CLIENT -include $(DEPTH)/mozilla-config.h'
     _USE_CPP_INCLUDE_FLAG=1