Ports: Add nnn port

This ports the nnn (n³ / Nnn's Not Noice) file manager.

Ports/nnn/patches/0001-Remove-needless-include-of-ftw.patch

@@ -0,0 +1,22 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Rene Hickersberger <r@renehsz.com>
+Date: Sat, 24 Jun 2023 01:15:26 +0200
+Subject: [PATCH] Remove needless include of ftw.h
+
+This header does not exist on Serenity, but it seems to be unused.
+---
+ src/nnn.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/src/nnn.c b/src/nnn.c
+index b3c0f986ff843b80b0e3c349ac70e151cc9de844..76833f3e08d0a0abfa22ae65cb381855e85fd048 100644
+--- a/src/nnn.c
++++ b/src/nnn.c
+@@ -105,7 +105,6 @@
+ #ifndef __USE_XOPEN_EXTENDED
+ #define __USE_XOPEN_EXTENDED 1
+ #endif
+-#include <ftw.h>
+ #include <pwd.h>
+ #include <grp.h>
+