Get rid of MG_ENABLE_LOG, change mg_hexdump()

src/log.h

@@ -8,27 +8,13 @@ void mg_log(const char *fmt, ...) PRINTF_LIKE(1, 2);
 bool mg_log_prefix(int ll, const char *file, int line, const char *fname);
 void mg_log_set(const char *spec);
 void mg_log_set_callback(void (*fn)(const void *, size_t, void *), void *param);
-
-// Let the compiler always see the log invocation in order to check parameters
-// For MG_ENABLE_LOG=0 case, the call will be optimised out, anyway
-
-#if MG_ENABLE_LOG
+void mg_hexdump(const void *buf, size_t len);
 
 #define MG_LOG(level, args)                                                \
   do {                                                                     \
     if (mg_log_prefix((level), __FILE__, __LINE__, __func__)) mg_log args; \
   } while (0)
 
-#else
-
-#define MG_LOG(level, args) \
-  do {                      \
-    (void) level;           \
-    if (0) mg_log args;     \
-  } while (0)
-
-#endif
-
 #define MG_ERROR(args) MG_LOG(MG_LL_ERROR, args)
 #define MG_INFO(args) MG_LOG(MG_LL_INFO, args)
 #define MG_DEBUG(args) MG_LOG(MG_LL_DEBUG, args)