#1 RPM step should check for rpmbuild

[Anonymous]

The rpm step should look for rpmbuild (`which rpmbuild`) before executing epm. If rpmbuild is not installed when epm is built, epm will default back to using the rpm command in the raw. Sadly, `rpm` does not support the -bb option any longer. this leads to the dreaded "unsupported option -bb" at the -r step from ape scripts. If rpmbuild is not found, ape should throw an error stating that rpm-build/rpmbuild needs to be installed and epm may need to be recompiled.

To fix an ape install manually:
* install rpmbuild
* rebuild epm via it's ape script
* clean out the rpm step temp files: `rm -rf /ape/_compile/util/tmp-build/buildroot/*`