add missing include for ports-gcc

graphics/cal3d/Makefile

@@ -1,8 +1,8 @@
-# $OpenBSD: Makefile,v 1.17 2018/10/24 14:28:05 sthen Exp $
+# $OpenBSD: Makefile,v 1.18 2018/11/29 21:06:27 naddy Exp $
 
 COMMENT =	skeletal based character animation library
 DISTNAME =	cal3d-0.11.0
-REVISION =	6
+REVISION =	7
 
 SHARED_LIBS =	cal3d	1.0	# .12.0
 

graphics/cal3d/patches/patch-src_cal3d_platform_h

@@ -0,0 +1,13 @@
+$OpenBSD: patch-src_cal3d_platform_h,v 1.1 2018/11/29 21:06:27 naddy Exp $
+
+Index: src/cal3d/platform.h
+--- src/cal3d/platform.h.orig
++++ src/cal3d/platform.h
+@@ -76,6 +76,7 @@ typedef int intptr_t;
+ 
+ // standard includes
+ #include <stdlib.h>
++#include <string.h>
+ #include <math.h>
+ 
+ // debug includes