Add AFL fuzz test

* Original commit: espressif/esp-idf@4c2622755d

components/mdns/test_afl_fuzz_host/Makefile

@@ -0,0 +1,35 @@
+TEST_NAME=test
+FUZZ=afl-fuzz
+CC=afl-clang-fast
+CPP=$(CC)
+LD=$(CC)
+OBJECTS=mdns.o test.o
+CFLAGS=-DMDNS_TEST_MODE -I. -I../include
+
+OS := $(shell uname)
+ifeq ($(OS),Darwin)
+  LDLIBS=
+else
+  LDLIBS=-lbsd
+  CFLAGS+=-DUSE_BSD_STRING
+endif
+
+all: $(TEST_NAME)
+
+%.o: %.c
+	@echo "[CC] $<"
+	@$(CC) $(CFLAGS) -c $< -o $@
+
+mdns.o: ../mdns.c
+	@echo "[CC] $<"
+	@$(CC) $(CFLAGS) -c $< -o $@
+
+$(TEST_NAME): $(OBJECTS)
+	@echo "[LD] $@"
+	@$(LD) $(LDLIBS) $(OBJECTS) -o $@
+
+fuzz: $(TEST_NAME)
+	@$(FUZZ) -i "in" -o "out" -- ./$(TEST_NAME)
+
+clean:
+	@rm -rf *.o *.SYM $(TEST_NAME) out