bugfix: destroy `pool` before the daemon process exits.

patches/nginx-1.13.6-daemon-destroy-pool.patch

@@ -0,0 +1,12 @@
+diff --git a/src/os/unix/ngx_daemon.c b/src/os/unix/ngx_daemon.c
+index ab672110..4bf09e77 100644
+--- a/src/os/unix/ngx_daemon.c
++++ b/src/os/unix/ngx_daemon.c
+@@ -23,6 +23,7 @@ ngx_daemon(ngx_log_t *log)
+         break;
+ 
+     default:
++        ngx_destroy_pool(ngx_cycle->pool);
+         exit(0);
+     }
+ 

util/mirror-tarballs

@@ -65,6 +65,11 @@ if [ "$answer" = "Y" ]; then
     echo "$info_txt applying the resolver_conf_parsing patch for nginx"
     patch -p1 < $root/patches/nginx-$main_ver-resolver_conf_parsing.patch || exit 1
     echo
+
+    echo "$info_txt applying the daemon-destroy-pool patch for nginx"
+    patch -p1 < $root/patches/nginx-$main_ver-daemon-destroy-pool.patch || exit 1
+    echo
+
 fi
 
 answer=`$root/util/ver-ge "$main_ver" 1.5.12`