Check RHEL presence for comparisons
A subtle bug is to check for RHEL version smaller than needed:
In RPM macros, '0%{?rhel} < 9' would always be true even if %rhel macro
is not defined because of the '0' prefix -- '0 < 9' is always true.
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>