Add mg_check_ip_acl()

src/util.h

@@ -19,6 +19,7 @@ unsigned long mg_unhexn(const char *s, size_t len);
 int mg_asprintf(char **buf, size_t size, const char *fmt, ...);
 int mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
 int64_t mg_to64(struct mg_str str);
+int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
 double mg_time(void);
 unsigned long mg_millis(void);
 void mg_usleep(unsigned long usecs);