BUILD: Remove unnecessary *flags from test_ipa_dn
sh-4.4$ grep wrap src/providers/ipa/ipa_dn.c src/tests/cmocka/test_ipa_dn.c
sh-4.4$ grep UNIT_TESTING src/providers/ipa/ipa_dn.c src/tests/cmocka/test_ipa_dn.c
Reviewed-by: Fabiano FidĂȘncio <fidencio@redhat.com>