misc/viz: include errno.h for errno

errno must be accessed by a macro from errno.h.  This program was
partially converted in it's initial commit, but the removal of errno
declerations was incomplete.

misc/viz/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	viz
 PORTVERSION=	1.1.1
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	misc
 MASTER_SITES=	LOCAL/fenner
 

misc/viz/files/patch-lists.c

@@ -0,0 +1,13 @@
+--- lists.c.orig
++++ lists.c
+@@ -6,10 +6,6 @@
+ 
+ #include "viz.h"
+ 
+-extern errno;
+-
+-extern char *malloc();
+-
+ void
+ printlist(level, list)
+ int level;

misc/viz/files/patch-loadfile.c

@@ -0,0 +1,13 @@
+--- loadfile.c.orig
++++ loadfile.c
+@@ -1,9 +1,8 @@
++#include <errno.h>
+ #include <stdio.h>
+ #include <sys/types.h>
+ #include <sys/stat.h>
+ #include <sys/fcntl.h>
+-
+-extern errno;
+ 
+ char *loadfile(path)
+ char *path;