intltool: Fix instance of Unescaped left brace in regex

Found out while trying to run tests on glade3

srcpkgs/intltool/patches/perl522.patch

@@ -44,3 +44,14 @@ Unescaped left brace in regex is deprecated, passed through in regex; marked by
      }
  
      # \s makes this not work, why?
+--- intltool-update.in	2015-05-27 00:20:43.038379963 +0200
++++ intltool-update.in	2015-05-27 00:23:53.309078052 +0200
+@@ -1068,7 +1068,7 @@ sub SubstituteVariable
+ 	my $untouched = $1;
+ 	my $sub = "";
+         # Ignore recursive definitions of variables
+-        $sub = $varhash{$2} if defined $varhash{$2} and $varhash{$2} !~ /\${?$2}?/;
++        $sub = $varhash{$2} if defined $varhash{$2} and $varhash{$2} !~ /\$\{?$2\}?/;
+ 
+ 	return SubstituteVariable ("$untouched$sub$rest");
+     }

srcpkgs/intltool/template

@@ -1,7 +1,7 @@
 # Template build file for 'intltool'.
 pkgname=intltool
 version=0.51.0
-revision=3
+revision=4
 noarch=yes
 build_style=gnu-configure
 hostmakedepends="perl-XML-Parser"