[zeromq] also add libtool to BR

[tomspur]

commit afc37757d4d2f02a8bf4edf073d3b6f700d88f11
Author: Thomas Spura <thomas.spura at gmail.com>
Date:   Wed Mar 27 17:05:26 2013 +0100

    also add libtool to BR

 zeromq.spec |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/zeromq.spec b/zeromq.spec
index a42adc1..475a5d5 100644
--- a/zeromq.spec
+++ b/zeromq.spec
@@ -13,6 +13,7 @@ Source0:        http://download.zeromq.org/zeromq-%{version}.tar.gz
 
 BuildRequires:  autoconf
 BuildRequires:  automake
+BuildRequires:  libtool
 
 BuildRequires:  glib2-devel
 %if ! (0%{?fedora} > 12 || 0%{?rhel} > 5)