Avoid casting away 'const'.
Avoid casting away 'const'.

* subversion/libsvn_wc/props.c
  (combine_mergeinfo_props, combine_forked_mergeinfo_props,
   apply_single_mergeinfo_prop_change): Put the result in a temporary
    variable first to avoid casting away 'const'.

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