$OpenBSD: patch-src_porting_cpp,v 1.6 2020/09/09 11:32:12 semarie Exp $
Define environ variable on OpenBSD.

https://github.com/minetest/minetest/commit/9c7340104a7ec4007e3dfe0bb4482f3c8f9878e0

Index: src/porting.cpp
--- src/porting.cpp.orig
+++ src/porting.cpp
@@ -25,7 +25,7 @@ with this program; if not, write to the Free Software 
 
 #include "porting.h"
 
-#if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(__DragonFly__)
+#if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(__DragonFly__) || defined(__OpenBSD__)
 	#include <sys/types.h>
 	#include <sys/sysctl.h>
 	extern char **environ;
