Add redhat-rpm-config to rpm build deps

This is needed on Fedora systems to build python packages with
gcc, but for some reason is not listed as a python-devel dep.

Change-Id: Ia7479154867902b816603dc2babf6b08b91ca919
diff --git a/bindep.txt b/bindep.txt
index 5db144b..8dffd0f 100644
--- a/bindep.txt
+++ b/bindep.txt
@@ -15,3 +15,4 @@
 python-dev [platform:dpkg]
 python-devel [platform:rpm]
 bubblewrap [platform:rpm]
+redhat-rpm-config [platform:rpm]