Bug 17731: Remove noxml option from rebuild_zebra.pl

Bug 17731: Remove noxml option from rebuild_zebra.pl

The removal of the noxml is a logical follow-up of bug 16506 (which
make xml the default).

Actually this option should have been removed by bug 10455 (it removes
the biblioitem.marc field).

Test plan:
Make sure the rebuild_zebra.pl script works as before.

Signed-off-by: Emma Smith <emma.nakamura.smith@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 7a2cbfba1f271d307045d867654ff0d7de939aa6)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>