* tools/dev/unix-build/Makefile.svn: Update my custom build script,
   which is also used by the bb-openbsd build bot, to APR 1.4.8.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1564943 13f79535-47bb-0310-9956-ffa450edef68