build: Move check for XML::XPath into bootstrap

The module XML::XPath is needed when building from git only (no need to
have it when building from tarball), so this patch moves the check from
specfile into bootstrap.conf.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

bootstrap.conf

 # Bootstrap configuration.
 
-# Copyright (C) 2010-2013 Red Hat, Inc.
+# Copyright (C) 2010-2014 Red Hat, Inc.
 
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -210,6 +210,7 @@ gzip       -
 libtool    -
 patch      -
 perl       5.5
+perl::XML::XPath -
 pkg-config -
 python-config -
 rpcgen     -

libvirt.spec.in

@@ -427,7 +427,6 @@ BuildRequires: /usr/bin/pod2man
 %endif
 BuildRequires: git
 BuildRequires: perl
-BuildRequires: perl-XML-XPath
 BuildRequires: python
 %if %{with_systemd}
 BuildRequires: systemd-units