[packages] net/wget: Fix error in texi2pod intriduced with Perl 5.18

taken from http://lists.gnu.org/archive/html/bug-wget/2013-06/msg00046.html
from http://freetz.org/browser/trunk/make/wget/patches/040-fix-error-in-texi2pod-introduced-with-perl-5.18.patch

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>