Description of problem:
when rebuilding rpm and the redhat-release package is not installed,
the build stage will not create
If this happens, the rebuild will fail as it checks for the assistance
Version-Release number of selected component (if applicable):
Thus it would be advisable to include redhat-release or
/etc/redhat-release into the BuildRequirements.
rpm is built on other distros that do not have /etc/redhat-release.
/etc/redhat-release is like certain other build dependencies,
lik gcc and make, that are assumed rather than specified.