PROTON-208: Creates an upstream Perl tarball for Proton.

Bundles together the contents of the proton-c/bindings/perl directory to
be used for generating the Perl language bindings.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1440565 13f79535-47bb-0310-9956-ffa450edef68