Take a softer approach to unused symbols.
Take a softer approach to unused symbols.

* libsvn_delta/compose_delta.c: Remove #if 0/#endif pairs, and "use" the
symbols that were commented out instead.

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