Change:
- Other targets might remove rpm-build as they clean up after
themselves. Ensure that it's present in setup_rpm_repo because
rpmfluff needs it.
Test Plan:
- Local experimentation with yum_repository and mysql_db (the latter of
which depends on a handler which was removing rpm-build) on
stable-2.9.
Signed-off-by: Rick Elrod <rick@elrod.me>