sysutils/screen: Add session creation time when list active sessions

Reimplement Debian patches to display screen session creation time and
sort the list of sessions by date.

Output example for 'screen -ls' command
---------------------------------------
There is a screen on:
        14059.pts-7.1302amd64-head      (08/15/23 10:02:52)     (Attached)
1 Socket in /tmp/screens/S-root.

Reviewed by:  cy
Differential Revision: https://reviews.freebsd.org/D41469

1 files changed, 31 insertions, 0 deletions

diff --git a/sysutils/screen/files/patch-misc.c b/sysutils/screen/files/patch-misc.c
new file mode 100644
index 000000000000..1364b230d55a
--- /dev/null
+++ b/sysutils/screen/files/patch-misc.c
@@ -0,0 +1,31 @@
+--- misc.c.orig	2022-01-28 14:06:02 UTC
++++ misc.c
+@@ -28,8 +28,10 @@
+ 
+ #include <poll.h>
+ #include <sys/types.h>
++#include <sys/user.h>
+ #include <sys/stat.h>	/* mkdir() declaration */
+ #include <signal.h>
++#include <libutil.h>
+ 
+ #include "config.h"
+ #include "screen.h"
+@@ -796,3 +798,17 @@
+ }
+ 
+ #endif
++
++time_t
++SessionCreationTime(fifo)
++const char *fifo;
++{
++  int pid = atoi(fifo);
++  if (pid <= 0) return 0;
++
++  struct kinfo_proc * kip = kinfo_getproc(pid);
++  if (kip == 0) return 0;
++  time_t start = kip->ki_start.tv_sec;
++  free (kip);
++  return start;
++}