Function svn_mergeinfo_sort 

pub unsafe extern "C" fn svn_mergeinfo_sort(
    mergeinfo: svn_mergeinfo_t,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Take a hash of mergeinfo in @a mergeinfo, and sort the rangelists associated with each key (in place).

TODO(miapi): mergeinfos should always be sorted. This should be a private function.

@since New in 1.5