Add option to enable locking using user's password.

PR:		153548

sysutils/screen/Makefile

@@ -7,7 +7,7 @@
 
 PORTNAME=	screen
 PORTVERSION=	4.0.3
-PORTREVISION=	9
+PORTREVISION=	10
 CATEGORIES=	sysutils
 MASTER_SITES=	ftp://ftp.uni-erlangen.de/pub/utilities/screen/ \
 		http://komquats.com/distfiles/ \

sysutils/screen/files/patch-attacher.c

@@ -0,0 +1,24 @@
+--- attacher.c.orig	2003-09-08 07:24:48.000000000 -0700
++++ attacher.c	2011-01-02 21:42:39.547897531 -0800
+@@ -662,7 +662,7 @@
+   printf("\n");
+ 
+   prg = getenv("LOCKPRG");
+-  if (prg && strcmp(prg, "builtin") && !access(prg, X_OK))
++  if (prg && (strcmp(prg, "builtin") || strcmp(prg,"builtin-passwd")) && !access(prg, X_OK))
+     {
+       signal(SIGCHLD, SIG_DFL);
+       debug1("lockterminal: '%s' seems executable, execl it!\n", prg);
+@@ -676,7 +676,11 @@
+           setuid(real_uid);	/* this should be done already */
+ #endif
+           closeallfiles(0);	/* important: /etc/shadow may be open */
+-          execl(prg, "SCREEN-LOCK", NULL);
++          if (strcmp(prg,"builtin-passwd"))
++            /* use system passsword for lock */
++            execl(prg, "SCREEN-LOCK", "-p", "-n", NULL);
++          else
++            execl(prg, "SCREEN-LOCK", NULL);
+           exit(errno);
+         }
+       if (pid == -1)