$OpenBSD: patch-src_include_OpenImageIO_strutil_h,v 1.2 2020/08/15 20:31:04 rsadowski Exp $

Add missing header for ports-gcc

Index: src/include/OpenImageIO/strutil.h
--- src/include/OpenImageIO/strutil.h.orig
+++ src/include/OpenImageIO/strutil.h
@@ -42,6 +42,7 @@
 #define OPENIMAGEIO_STRUTIL_H
 
 #include <string>
+#include <cstdarg>
 #include <cstdio>
 #include <vector>
 #include <map>
