Fix absolute/relative time mismatch in LOCK function.

Fix absolute/relative time mismatch in LOCK function.

The time passed by the LOCK function to an internal function was relative
time when the function expected absolute time.

* Don't use C++ keywords in get_lock().

(closes issue ASTERISK-16868)
Reported by: Andrey Solovyev
Patches:
      20101102__issue18207.diff.txt (license #5003) patch uploaded by Andrey Solovyev (modified)
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Merged revisions 350311 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@350312 65c4cc65-6c06-0410-ace0-fbb531ad65f3