Add timezone to the possible fields in a timespec.

(closes issue #14028)
 Reported by: mostyn
 Patches: 
       timezone-v2.patch uploaded by mostyn (license 398)
       (with additional code guideline fixes and a memory leak fix by me - license 14)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@164976 65c4cc65-6c06-0410-ace0-fbb531ad65f3