Get rid of MG_ENABLE_LOG, change mg_hexdump()

mongoose.h

@@ -544,10 +544,6 @@ int sscanf(const char *, const char *, ...);
 #define MG_ENABLE_IPV6 0
 #endif
 
-#ifndef MG_ENABLE_LOG
-#define MG_ENABLE_LOG 1
-#endif
-
 #ifndef MG_ENABLE_MD5
 #define MG_ENABLE_MD5 0
 #endif
@@ -649,7 +645,6 @@ bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v);
 bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v);
 size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list ap);
 size_t mg_snprintf(char *, size_t, const char *fmt, ...) PRINTF_LIKE(3, 4);
-char *mg_hexdump(const void *buf, size_t len);
 char *mg_hex(const void *buf, size_t len, char *dst);
 void mg_unhex(const char *buf, size_t len, unsigned char *to);
 unsigned long mg_unhexn(const char *s, size_t len);
@@ -669,27 +664,13 @@ 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)