fix the two nits that prevent clang from compiling junk

misc/magicpoint/patches/patch-image_rlelib_c

@@ -0,0 +1,11 @@
+$OpenBSD: patch-image_rlelib_c,v 1.1 2017/04/28 10:01:01 espie Exp $
+--- image/rlelib.c.orig	Fri Apr 28 11:54:42 2017
++++ image/rlelib.c	Fri Apr 28 11:55:44 2017
+@@ -12,7 +12,6 @@
+ 
+ #include <stdio.h>
+ #include <math.h>
+-#include <varargs.h>
+ #include <ctype.h>
+ 
+ #include "image.h"		/* need ZFILE definition */

misc/magicpoint/patches/patch-mng_c

@@ -0,0 +1,12 @@
+$OpenBSD: patch-mng_c,v 1.1 2017/04/28 10:01:01 espie Exp $
+--- mng.c.orig	Fri Apr 28 11:52:25 2017
++++ mng.c	Fri Apr 28 11:53:19 2017
+@@ -43,6 +43,8 @@ typedef struct {
+ 	mng_uint32	delay;     /* ticks to wait before resuming decode */
+ } mngstuff;
+ 
++void mng_window_setup(mngstuff *, int, int, int, int);
++
+ /* callbacks for the mng decoder */
+ 
+ /* memory allocation; data must be zeroed */