[rpm-ostree] Add libattr-devel for latest libglnx

[Colin Walters]

commit 650bfe73dd1da000b3322b3703a05b9300a70be3
Author: Colin Walters <walters at verbum.org>
Date:   Tue Mar 10 20:45:03 2015 -0400

    Add libattr-devel for latest libglnx

 rpm-ostree.spec | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/rpm-ostree.spec b/rpm-ostree.spec
index 5a24d1d..0e58fea 100644
--- a/rpm-ostree.spec
+++ b/rpm-ostree.spec
@@ -20,6 +20,7 @@ BuildRequires: pkgconfig(rpm)
 BuildRequires: pkgconfig(hawkey)
 BuildRequires: pkgconfig(libhif)
 BuildRequires: libcap-devel
+BuildRequires: libattr-devel
 
 # For now only treecompose requires this
 #Requires: /usr/bin/yum