fix "long long" tests for perl v5.6
Merge pull request #105 from talby-/perl-v5.6-compat

fix "long long" tests for perl v5.6

In testing reverse compatibility of the directors patches, there is a problem in the existing test-suite using perl v5.6.2. hex() appears to be unable to produce 64 bit integers in that version, this patch works around that problem.