KWSys 2013-10-15 (6eab64c3)

Extract upstream KWSys using the following shell commands.

$ git archive --prefix=upstream-kwsys/ 6eab64c3 | tar x
$ git shortlog --no-merges --abbrev=8 --format='%h %s' 96b2f6f4..6eab64c3
Raphael Kubo da Costa (1):
      6eab64c3 SystemInformation: Include backtrace-related headers on FreeBSD

Change-Id: Ib0447aab3d6555ce278f0c1417af2c53e6f181a5