Fix error in texi2pod introduced with Perl 5.18

Backport of a patch from Dave Reisner <dreisner@archlinux.org> found at https://lists.gnu.org/archive/html/bug-wget/2013-06/msg00046.html :
2013-06-17  Dave Reisner  <dreisner@archlinux.org>

	* texi2pod.pl: Fix formatting error that causes build to fail with
	Perl 5.18