mock on host: compile without rtti (no dynamic_cast<>(), like on native) (esp8266#5994)

* mock on host: compile without rtti (no dynamic_cast<>(), like on native)

Author: d-a-v

tests/host/Makefile

@@ -145,7 +145,7 @@ FLAGS += -DLWIP_IPV6=0
 FLAGS += -DHOST_MOCK=1
 FLAGS += -DNONOSDK221=1
 FLAGS += $(MKFLAGS)
-CXXFLAGS += -std=c++11 $(FLAGS)
+CXXFLAGS += -std=c++11 -fno-rtti $(FLAGS)
 CFLAGS += -std=c99 $(FLAGS)
 LDFLAGS += -coverage $(OPTZ) -g $(M32)
 VALGRINDFLAGS += --leak-check=full --track-origins=yes --error-limit=no --show-leak-kinds=all --error-exitcode=999