Update config.guess and config.sub for
expat build from
http://git.savannah.gnu.org/cgit/config.git.

Backport of r1575514+r1575515 from 1.5.x.


git-svn-id: https://svn.apache.org/repos/asf/apr/apr-util/branches/1.4.x@1575516 13f79535-47bb-0310-9956-ffa450edef68