Fix for .c files to ensure macro guards for wildcard

[dgarske]

Description

Fix for .c files to ensure macro guards for wildcard.

Testing

Makefile.testwildcard:

rwildcard=$(foreach d,$(wildcard $(1:=/*)),$(call rwildcard,$d,$2) $(filter $(subst *,%,$2),$d))
SOURCES:=$(call rwildcard,certs,*.c) $(call rwildcard,ctaocrypt,*.c) $(call rwildcard,cyassl,*.c) $(call rwildcard,examples,*.c) $(call rwildcard,src,*.c) $(call rwildcard,wolfcrypt,*.c) $(call rwildcard,wolfssl,*.c) \
    $(call rwildcard,sslSniffer,*.c) $(call rwildcard,tests,*.c) $(call rwildcard,testsuite,*.c) $(call rwildcard,wrapper,*.c)
OBJECTS:= $(patsubst %.c, %.o, $(SOURCES))

.PHONY: all
all: $(OBJECTS)

%.o: %.c
	gcc -c -I. -DWOLFSSL_USER_SETTINGS -DHAVE_NETDB_H -o $@ $<
	@echo "CC	$<	-o $@"

clean:
	@rm -rf $(OBJECTS)

Run: make -f Makefile.testwildcard

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation