maint: fix date in local gnulib patch

The local gnulib ssize_t.m4.diff patch no longer applied due to
changed context from the date change.

diff --git a/gnulib/local/m4/ssize_t.m4.diff b/gnulib/local/m4/ssize_t.m4.diff
index 08c2b9c952d55ce06b5f4d5cba6d8504bb721608..12cff1253c2d1cafc3134c64131a1a4e8c57a1c1 100644 (file)
--- a/gnulib/local/m4/ssize_t.m4.diff
+++ b/gnulib/local/m4/ssize_t.m4.diff
@@ -5,7 +5,7 @@ index 209d64c..5ea72a1 100644
 @@ -1,4 +1,4 @@
 -# ssize_t.m4 serial 5 (gettext-0.18.2)
 +# ssize_t.m4 serial 6 (gettext-0.18.2)
- dnl Copyright (C) 2001-2003, 2006, 2010-2014 Free Software Foundation, Inc.
+ dnl Copyright (C) 2001-2003, 2006, 2010-2015 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
 @@ -17,7 +17,21 @@ AC_DEFUN([gt_TYPE_SSIZE_T],