Import of code from heimdal

Import of code from heimdal

This commit updates the code imported from heimdal to
8ce821c38744b30e226ff024f675668b991b984d (switch-from-svn-to-git-1998-g8ce821c)

Upstream changes are:

Asanka C. Herath (2):
      Revert use of backslash as an escape for double quote in config strings
      Condition roken's ssize_t definition for compatibility

Love Hornquist Astrand (1):
      don't undefined SLIST

Change-Id: I8855e060e88008f95eb2b24b029843081702fc04
Reviewed-on: http://gerrit.openafs.org/3761
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>