(maint) Swap mock arches and copy from x86_64 to i386

Since this package is inherently noarch, we used to build it in an
i386 mock instead of a x86_64 one. With RHEL7 likely to go 64-bit only,
this commit swaps the mock arch and copies the resultant artifact correctly.
(maint) Don't build for EL7 32-bit

Other we'll populate an empty repo.
Tangent: I hate this fix.
Merge pull request #10 from mckern/master

(maint) Swap mock arches and copy from x86_64 to i386