Remove a redundant macro.
Remove a redundant macro.

* subversion/libsvn_subr/checksum.c
  (MAX): Remove.  It isn't being used, and we already define such a macro in
    a public header.

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