Add cmake support from 1.4.x branch (+ skiplist).

Add the CHANGES entry for cmake, since 1.5.first will be
the first release with it.


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.5.x@1528923 13f79535-47bb-0310-9956-ffa450edef68