Disabled logging alerts to syslog.

It feels to be causing more harm than good, because syslog() can be blocking,
which is even more critical under resource exhaustion conditions when some
alerts are expected.

src/nxt_app_log.c

@@ -19,7 +19,10 @@ static u_char *nxt_log_debug_time(u_char *buf, nxt_realtime_t *now,
 void nxt_cdecl
 nxt_log_time_handler(nxt_uint_t level, nxt_log_t *log, const char *fmt, ...)
 {
-    u_char             *p, *syslogmsg, *end;
+    u_char             *p, *end;
+#if 0
+    u_char             *syslogmsg;
+#endif
     va_list            args;
     nxt_thread_t       *thr;
     nxt_time_string_t  *time_cache;
@@ -34,7 +37,9 @@ nxt_log_time_handler(nxt_uint_t level, nxt_log_t *log, const char *fmt, ...)
 
     p = nxt_thread_time_string(thr, time_cache, msg);
 
+#if 0
     syslogmsg = p;
+#endif
 
 #if 0
     nxt_fid_t    fid;
@@ -79,6 +84,7 @@ nxt_log_time_handler(nxt_uint_t level, nxt_log_t *log, const char *fmt, ...)
 
     (void) nxt_write_console(nxt_stderr, msg, p - msg);
 
+#if 0
     if (level == NXT_LOG_ALERT) {
         *(p - nxt_length("\n")) = '\0';
 
@@ -88,6 +94,7 @@ nxt_log_time_handler(nxt_uint_t level, nxt_log_t *log, const char *fmt, ...)
          */
         nxt_write_syslog(LOG_ALERT, syslogmsg);
     }
+#endif
 }