Fix subshell support for 5.x which has grantpt(3).

svn path=/head/; revision=84921

misc/mc/files/patch-src::subshell.c

@@ -0,0 +1,11 @@
+--- src/subshell.c.orig	Tue Jul 15 20:36:24 2003
++++ src/subshell.c	Tue Jul 15 20:36:56 2003
+@@ -1166,6 +1166,8 @@
+ #elif IS_AIX
+     strcpy (pty_name, "/dev/ptc");
+     pty_master = open (pty_name, O_RDWR);
++#elif defined(__FreeBSD__)
++    pty_master = posix_openpt(O_RDWR);
+ #else
+     strcpy (pty_name, "/dev/ptmx");
+     pty_master = open (pty_name, O_RDWR);