isync: update to 1.3.1

This is a long overdue maintenance release:
- SSL now uses SNI, which for example GMail requires
- fixed fallbacks for missing UIDPLUS extension (with e.g. DavMail)
- fixed UIDVALIDITY recovery with really long Message-id headers
- fixed GSSAPI authentication with Kerberos
- fixed support for IMAP servers which do not sort search results (e.g.,
poczta.o2.pl)
- fixed CopyArrivalDate on platforms without glibc
- fixed useless SASL warnings with certain plugins
- the perl 5.14 requirement is now made explicit
- improved OpenBSD support
- fixed a bunch of compiler warnings

All patches except pledge support have been merged upstream.

Keeps working fine in daily usage on amd64.
OK?

Index: Makefile
===================================================================
RCS file: /cvs/ports/mail/isync/Makefile,v
retrieving revision 1.39
diff -u -p -r1.39 Makefile
--- Makefile 21 Feb 2019 19:22:27 -0000 1.39
+++ Makefile 12 Jun 2019 19:09:33 -0000
@@ -2,8 +2,7 @@

COMMENT= synchronize IMAP4 and maildir mailboxes

-DISTNAME= isync-1.3.0
-REVISION= 5
+DISTNAME= isync-1.3.1

CATEGORIES= mail
MASTER_SITES= ${MASTER_SITE_SOURCEFORGE:=isync/}
Index: distinfo
===================================================================
RCS file: /cvs/ports/mail/isync/distinfo,v
retrieving revision 1.13
diff -u -p -r1.13 distinfo
--- distinfo 17 Oct 2017 17:24:14 -0000 1.13
+++ distinfo 12 Jun 2019 19:09:38 -0000
@@ -1,2 +1,2 @@
-SHA256 (isync-1.3.0.tar.gz) = jV9YOXbjEZcFvbon+k/JYugH/1mW8k81SVcXj/ppfJw=
-SIZE (isync-1.3.0.tar.gz) = 309459
+SHA256 (isync-1.3.1.tar.gz) = aMtGQ9WBUgl/Acmzq+rX19TJVjGD1y88KjHSK8Fo8Oo=
+SIZE (isync-1.3.1.tar.gz) = 311868
Index: patches/patch-src_drv_imap_c
===================================================================
RCS file: /cvs/ports/mail/isync/patches/patch-src_drv_imap_c,v
retrieving revision 1.2
diff -u -p -r1.2 patch-src_drv_imap_c
--- patches/patch-src_drv_imap_c 21 Feb 2019 19:22:27 -0000 1.2
+++ patches/patch-src_drv_imap_c 12 Jun 2019 19:16:07 -0000
@@ -1,7 +1,6 @@
$OpenBSD: patch-src_drv_imap_c,v 1.2 2019/02/21 19:22:27 kn Exp $

-f85e2ae770169227e95168a11aff17372efaa192
-"Fix CopyArrivalDate on platforms without glibc"
+Use pledge.

Index: src/drv_imap.c
--- src/drv_imap.c.orig
@@ -15,16 +14,7 @@ Index: src/drv_imap.c
#ifdef HAVE_LIBSSL
enum { SSL_None, SSL_STARTTLS, SSL_IMAPS };