BUILD: Fix linking of ini_augment_ut_check
    
    libref_array was used in the unit test but it was mot linked with
    libref_array
      CCLD     ini_augment_ut_check
    /usr/bin/ld: ini/ini_augment_ut_check-ini_augment_ut_check.o:
        undefined reference to symbol 'ref_array_destroy@@REF_ARRAY_0.1.1'
    .libs/libref_array.so.1: error adding symbols: DSO missing from command line
    collect2: error: ld returned 1 exit status
    make[1]: *** [Makefile:1287: ini_augment_ut_check] Error 1
    
    Reviewed-by: Michal Židek <mzidek@redhat.com>
    
    Merges: https://pagure.io/SSSD/ding-libs/pull-request/3179