Log Message:
Fix build with perl 5.14... I think. Someone who actually knows how to
write Perl bindings should double-check this.

XXX: This will almost certainly not work on LP64 platforms as it casts
XXX: Perl-provided pointers to int and back. However, fixing this
XXX: requires changing the API of the parent Sablotron package, which
XXX: doesn't seem like a great idea at the moment.