package/fetchmail: gettextize to match the new gettext version

package/fetchmail: 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/8dd/8dd6651ce99c0b81497fd285909b2b614009e273/
http://autobuild.buildroot.net/results/0bb/0bbfddda94ac7f75f74a54157c27de5b4fb3e559/
http://autobuild.buildroot.net/results/92b/92bcb493619ce4508bc4571cbfc3d5c3bdf49ff4/
http://autobuild.buildroot.net/results/768/768efd71745c72cec159edaa92e266167629ec5d/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>