#58 no arch in rdiff_server.py (possibly install_packages?)

Running 'rdiff_server.py' against an x86_64 machine that has 'libgcc' for both
arch-es:

$ rdiff_server.py -h SERVER.doma.in -u root -i =>Processing server SERVER.doma.in
Processing local package db
Processing remote package db
libgcc (None, '4.4.4', '13.el6') (None, '4.4.5', '6.el6')
libgcc (None, '4.4.4', '13.el6') (None, '4.4.5', '6.el6')
Listing difference
### remote differs from local
--- local package db
+++ remote package db
- libgcc-4.4.5-6.el6.x86_64.rpm /var/cache/yum/x86_64/6Server/rhel-x86_64-server-6/packages
- gpg-pubkey-6b8d79e6-3f49313d.None.rpm None
+ libgcc-4.4.4-13.el6.i686.rpm /var/lib/cpacman/repos/rpms/el6/rhel6
Everything done. No problems noticed

but the packages are there:

$ rpm -qa --dbpath /opt/cpacman/servers/SERVER.doma.in/rpmdb/ | grep libgcc
libgcc-4.4.4-13.el6.i686
libgcc-4.4.5-6.el6.x86_64

$ ssh SERVER "rpm -qa | grep libgcc"
libgcc-4.4.5-6.el6.x86_64
libgcc-4.4.4-13.el6.i686