Fix DKIM canonization of headers formatted as Name:\r\n\tValue

Submitted upstream as
trusteddomainproject/OpenDKIM#119

mail/opendkim/Makefile

@@ -1,7 +1,7 @@
-# $NetBSD: Makefile,v 1.33 2020/08/31 18:09:58 wiz Exp $
+# $NetBSD: Makefile,v 1.34 2021/03/19 09:50:21 manu Exp $
 
 DISTNAME=	opendkim-2.10.3
-PKGREVISION=	6
+PKGREVISION=	7
 CATEGORIES=	mail
 MASTER_SITES=	${MASTER_SITE_SOURCEFORGE:=opendkim/}
 

mail/opendkim/distinfo

@@ -1,8 +1,9 @@
-$NetBSD: distinfo,v 1.20 2020/01/07 13:35:13 sborrill Exp $
+$NetBSD: distinfo,v 1.21 2021/03/19 09:50:21 manu Exp $
 
 SHA1 (opendkim-2.10.3.tar.gz) = 4e9b966860bcfbca6441ed84a95bbe762fff69f4
 RMD160 (opendkim-2.10.3.tar.gz) = c6553757ae9675434e647f3cc1e6357bc60c7d2a
 SHA512 (opendkim-2.10.3.tar.gz) = 97923e533d072c07ae4d16a46cbed95ee799aa50f19468d8bc6d1dc534025a8616c3b4b68b5842bc899b509349a2c9a67312d574a726b048c0ea46dd4fcc45d8
 Size (opendkim-2.10.3.tar.gz) = 1210224 bytes
 SHA1 (patch-configure.ac) = c9ae182ed2c5c2ec3018fe4c6066ed7fa0d3686f
+SHA1 (patch-libopendkim_dkim-canon.c) = 82dc322f86981feddc2ad0100b33ce1eca7435d6
 SHA1 (patch-opendkim_opendkim-crypto.c) = d7d08fda3dba5bf9cb834123218b1e89b78878e5

mail/opendkim/patches/patch-libopendkim_dkim-canon.c

@@ -0,0 +1,21 @@
+$NetBSD: patch-libopendkim_dkim-canon.c,v 1.1 2021/03/19 09:50:21 manu Exp $
+
+--- libopendkim/dkim-canon.c.orig	2021-03-18 09:50:14.195951232 +0100
++++ libopendkim/dkim-canon.c	2021-03-19 09:49:52.141301747 +0100
+@@ -386,10 +386,14 @@
+ 				break;
+ 			}
+ 		}
+
+-		/* skip all spaces before first word */
+-		while (*p != '\0' && DKIM_ISWSP(*p))
++		/*
++		 * skip all spaces before first word 
++		 * we also need to skip CRLF for long header formatted as
++		 * Header-Name:\r\n\tHeader-value
++		 */
++		while (*p != '\0' && DKIM_ISLWSP(*p))
+ 			p++;
+
+ 		space = FALSE;				/* just saw a space */
+