mod_mongo: pass CXXFLAGS to mongo build

src/mod/applications/mod_mongo/Makefile

@@ -25,7 +25,7 @@ $(MONGO_CXX_DRIVER_SRC):
 
 $(LIBMONGOCLIENT_A): $(MONGO_CXX_DRIVER_SRC)
 	(cd $(MONGO_CXX_DRIVER_SRC) && \
-		sed -i SConstruct -e "s/Environment()/Environment(ENV = {'PATH' : os.environ['PATH'],'CFLAGS' : os.environ['CFLAGS']})/" && \
+		sed -i SConstruct -e "s/Environment()/Environment(ENV = {'PATH' : os.environ['PATH'],'CFLAGS' : os.environ['CFLAGS'],'CXXFLAGS' : os.environ['CXXFLAGS']})/" && \
 		echo "env.Append(PATH=os.environ['PATH'])" >> SConstruct && \
 		scons)
 	$(TOUCH_TARGET)