Add missing debug symbol to functest_ binaries

Makefile

@@ -15,6 +15,7 @@ endif
 bin/functest_$(subst /,_,$(SCHEME)): test/$(dir $(SCHEME))functest.c $(wildcard $(SCHEME)/clean/*.c) $(wildcard $(SCHEME)/clean/*.h) | require_scheme
 	mkdir -p bin
 	$(CC) $(CFLAGS) \
+		-g \
 		-DPQCLEAN_NAMESPACE=$(shell echo PQCLEAN_$(subst -,,$(notdir $(SCHEME))) | tr a-z A-Z) \
 		-iquote "./common/" \
 		-iquote "$(SCHEME)/clean/" \