build: Move libini_config 1.1.0 check to libini_config.m4
    
    Move the check for libini_config >= 1.1.0 from samba.m4 to
    libini_config.m4 to have them all in one place, simplifying maintenance.
    Set boolean variables for every detected version and use one of them in
    samba.m4 instead.
    
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>