* tools/dev/unix-build/Makefile.svn: Use compatible serf for Subversion 1.5.
* tools/dev/unix-build/Makefile.svn: Use compatible serf for Subversion 1.5.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion