Squash truncation warning

Makefile

@@ -41,7 +41,7 @@ mg_prefix: mongoose.c mongoose.h
 	$(CLANG) mongoose.c $(CFLAGS) -c -o /tmp/x.o && nm /tmp/x.o | grep ' T' | grep -v 'mg_' ; test $$? = 1
 
 # C++ build
-test++: CLANG = g++ -Wno-deprecated -Wno-missing-field-initializers -Wno-error=format-truncation -Wno-unknown-warning-option
+test++: CLANG = g++ -Wno-deprecated -Wno-missing-field-initializers
 test++: unamalgamated
 
 # Make sure we can build from an unamalgamated sources
@@ -92,7 +92,7 @@ linux: Makefile mongoose.c mongoose.h test/unit_test.c
 	$(GCC) $(CC) mongoose.c test/unit_test.c $(CFLAGS) $(LDFLAGS) -o unit_test_gcc
 	$(GCC) ./unit_test_gcc
 
-linux++: CC = g++ -Wno-missing-field-initializers -Wno-error=format-truncation
+linux++: CC = g++ -Wno-missing-field-initializers
 linux++: linux
 
 mongoose.c: $(SRCS) Makefile