Add gnulib patch to fix FTBFS with perl 5.22

grep-2.21-gnulib.patch

@@ -0,0 +1,11 @@
+--- grep-2.21/build-aux/update-copyright.orig	2015-08-02 18:10:29.174256966 +0100
++++ grep-2.21/build-aux/update-copyright	2015-08-02 18:11:19.926287054 +0100
+@@ -124,7 +124,7 @@
+ use warnings;
+ 
+ my $copyright_re = 'Copyright';
+-my $circle_c_re = '(?:\([cC]\)|@copyright{}|©)';
++my $circle_c_re = '(?:\([cC]\)|@copyright\{}|\\\\\(co|©)';
+ my $holder = $ENV{UPDATE_COPYRIGHT_HOLDER};
+ $holder ||= 'Free Software Foundation, Inc.';
+ my $prefix_max = 5;

grep.spec

@@ -22,6 +22,8 @@ Patch2: grep-2.21-buf-overrun-fix.patch
 # backported from upstream
 # http://git.savannah.gnu.org/cgit/grep.git/commit/?id=c8b9364d5900a40809827aee6cc53705073278f6
 Patch3: grep-2.21-recurse-behaviour-change-doc.patch
+# http://www.mail-archive.com/bug-gnulib%40gnu.org/msg31638.html
+Patch4: grep-2.21-gnulib.patch
 Requires(post): /sbin/install-info
 Requires(preun): /sbin/install-info
 
@@ -43,6 +45,7 @@ GNU grep is needed by many scripts, so it shall be installed on every system.
 %patch1 -p1 -b .help-align
 %patch2 -p1 -b .buf-overrun-fix
 %patch3 -p1 -b .recurse-behaviour-change-doc
+%patch4 -p1 -b .gnulib
 
 chmod 755 tests/kwset-abuse
 
@@ -98,6 +101,7 @@ fi
 * Sun Aug  2 2015 Peter Robinson <pbrobinson@fedoraproject.org> 2.21-7
 - Minor spec cleanups and modifications
 - Drop Changelog, details in NEWS
+- Add gnulib patch to fix FTBFS with perl 5.22
 
 * Wed Jun 17 2015 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 2.21-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_23_Mass_Rebuild