Fix RHEL 9 and ELN builds
    
    On RHEL 9 and ELN pki-core should be using JDK 11.
    
    Normalize several conditions where RHEL was assumed to use 'older' build
    method. RHEL 9+ as well as ELN are using the same methods as Fedora 33+.
    
    Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>