libidn: add patch for CVE-2017-14062

taken from upstream, git revision e9e81b8063b095b02cf104bb992fa9bf9515b9d8

srcpkgs/libidn/patches/CVE-2017-14062.patch

@@ -0,0 +1,31 @@
+From e9e81b8063b095b02cf104bb992fa9bf9515b9d8 Mon Sep 17 00:00:00 2001
+From: =?utf8?q?Tim=20R=C3=BChsen?= <tim.ruehsen@gmx.de>
+Date: Fri, 1 Sep 2017 10:04:48 +0200
+Subject: [PATCH] lib/punycode.c (decode_digit): Fix integer overflow
+
+This fix is a backport from libidn2 and addresses
+CVE-2017-14062.
+---
+ lib/punycode.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/lib/punycode.c b/lib/punycode.c
+index 86819a7..49250a1 100644
+--- lib/punycode.c
++++ lib/punycode.c
+@@ -88,10 +88,10 @@ enum
+ /* point (for use in representing integers) in the range 0 to */
+ /* base-1, or base if cp does not represent a value.          */
+ 
+-static punycode_uint
+-decode_digit (punycode_uint cp)
++static unsigned
++decode_digit (int cp)
+ {
+-  return cp - 48 < 10 ? cp - 22 : cp - 65 < 26 ? cp - 65 :
++  return (unsigned) cp - 48 < 10 ? cp - 22 : cp - 65 < 26 ? cp - 65 :
+     cp - 97 < 26 ? cp - 97 : base;
+ }
+ 
+-- 
+1.9.1

srcpkgs/libidn/template

@@ -1,7 +1,7 @@
 # Template build file for 'libidn'.
 pkgname=libidn
 version=1.33
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--disable-csharp --disable-java --disable-static --enable-threads=posix"
 hostmakedepends="perl pkg-config automake libtool gettext-devel"