Add flag to use strip -g instead of full strip on DSOs (RhBug:1663264)
    
    The find-debuginfo.sh flag -g had exactly this meaning. But from
    version rpm-4.13.0-alpha flag -g changes its behavior. It affects
    both libraries and executables.
    
    For some packages the original behavior was preferred. That is why
    the new find-debuginfo.sh flag --g-libs is created.
    
    Options -g and --g-libs are mutually exclusive.
    
    Adjusted for rpm-4.14.2 in RHEL