Merge r1618843 from apr trunk:

Fix Android compile error caused by assumption that crypt is available.

PR: 56627
Submitted by: Fredrik Fornwall <fredrik fornwall.net>, trawick


git-svn-id: https://svn.apache.org/repos/asf/apr/apr-util/branches/1.5.x@1618845 13f79535-47bb-0310-9956-ffa450edef68