Extract upstream KWSys using the following shell commands.

$ git archive --prefix=upstream-kwsys/ 5a15cb3b | tar x
$ git shortlog --no-merges --abbrev=8 --format='%h %s' 87c65319..5a15cb3b
Brad King (1):
      5a15cb3b Base64: Use size_t for lenghts in API

Change-Id: I09a2c5d6b67280f96d580c7b26bf8b2aa0bdb709