package/coreutils: gettextize to match the new gettext version

The gettext macros in the package are from a gettext version older than
the one we have in Buildroot, so autoreconf fails.

Run gettextize prior to running autoreconf, like we do in wget.

Fixes:
    http://autobuild.buildroot.net/results/228/228224668be4376844fe924d0a5b346af0414460/
    http://autobuild.buildroot.net/results/ac4/ac4dbb1342e9c9f1de5412e0b71fe4422ef744ef/
    http://autobuild.buildroot.net/results/a0c/a0c25faf149de9d51768eed8ff5a2274282cd797/


    ...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>