Unbreak runtime by using posix_openpt; I'm not quite sure how I missed this

in my tests...

devel/vte3/Makefile

@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.19 2012/11/13 08:24:52 jasper Exp $
+# $OpenBSD: Makefile,v 1.20 2012/12/13 19:37:50 ajacoutot Exp $
 
 SHARED_ONLY=		Yes
 
@@ -6,6 +6,7 @@ COMMENT=		terminal emulation library
 
 GNOME_PROJECT=		vte
 GNOME_VERSION=		0.34.2
+REVISION=		0
 
 PKGNAME=		vte3-${GNOME_VERSION}
 

devel/vte3/patches/patch-src_pty_c

@@ -0,0 +1,16 @@
+$OpenBSD: patch-src_pty_c,v 1.5 2012/12/13 19:37:50 ajacoutot Exp $
+--- src/pty.c.orig	Thu Dec 13 20:33:04 2012
++++ src/pty.c	Thu Dec 13 20:33:27 2012
+@@ -841,11 +841,7 @@ _vte_pty_getpt(GError **error)
+ 	/* Call the system's function for allocating a pty. */
+ 	fd = getpt();
+ #else
+-	/* Try to allocate a pty by accessing the pty master multiplex. */
+-	fd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
+-	if ((fd == -1) && (errno == ENOENT)) {
+-		fd = open("/dev/ptc", O_RDWR | O_NOCTTY); /* AIX */
+-	}
++	fd = posix_openpt(O_RDWR | O_NOCTTY);
+ #endif
+         if (fd == -1) {
+                 g_set_error (error, VTE_PTY_ERROR,