Enable i686

Hi,

please consider pulling these commits. I've made some small adjustments to make it possible to build i686 in mock. Unfortunately, the tests don't seem to pass (even on x86_64), not sure why.

Here's build with make check skipped: http://koji.fedoraproject.org/koji/taskinfo?taskID=6824111
Failed tests: http://koji.fedoraproject.org/koji/taskinfo?taskID=6836696

Thank you!
Lubo