QPID-4493: Fixes a memory leak in the Perl language bindings.

Replaces creating hashes and arrays using a scalar type with the
appropriate Perl API calls for creating a hash and an array.

Submitted by: Jimmy Jones <jimmyjones2@gmx.co.uk>

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1439422 13f79535-47bb-0310-9956-ffa450edef68