rhel: Add buildrequires for libtool and automake.

Those two packages are needed to build but they might not
be present in the system.

Signed-off-by: Flavio Leitner <fbl@redhat.com>
Acked-by: Russell Bryant <rbryant@redhat.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

rhel/openvswitch-fedora.spec.in

@@ -30,7 +30,7 @@ License: ASL 2.0 and LGPLv2+ and SISSL
 Release: 1%{?dist}
 Source: http://openvswitch.org/releases/%{name}-%{version}.tar.gz
 
-BuildRequires: autoconf
+BuildRequires: autoconf automake libtool
 BuildRequires: systemd-units openssl openssl-devel
 BuildRequires: python python-twisted-core python-zope-interface PyQt4
 BuildRequires: desktop-file-utils