ports: Add nano port

ports/nano/patches/0001-implement-getprogname.patch

@@ -0,0 +1,21 @@
+diff -ruN nano-8.5/lib/getprogname.c nano-8.5-banan_os/lib/getprogname.c
+--- nano-8.5/lib/getprogname.c	2025-06-12 10:29:39.000000000 +0300
++++ nano-8.5-banan_os/lib/getprogname.c	2025-08-19 01:25:56.020428849 +0300
+@@ -50,7 +50,7 @@
+ # include <sys/procfs.h>
+ #endif
+ 
+-#if defined __SCO_VERSION__ || defined __sysv5__
++#if defined __SCO_VERSION__ || defined __sysv5__ || defined __banan_os__
+ # include <fcntl.h>
+ # include <string.h>
+ #endif
+@@ -265,7 +265,7 @@
+         }
+     }
+   return NULL;
+-# elif defined __SCO_VERSION__ || defined __sysv5__                /* SCO OpenServer6/UnixWare */
++# elif defined __SCO_VERSION__ || defined __sysv5__ || defined __banan_os__                /* SCO OpenServer6/UnixWare */
+   char buf[80];
+   int fd;
+   sprintf (buf, "/proc/%d/cmdline", getpid());