Fix ap_uuencode()

PR: 3411
Submitted by: Ronald Tschal�r <ronald@innovation.ch>
Reviewed by: Dirk, Lars, Ronald


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82952 13f79535-47bb-0310-9956-ffa450edef68