Revision 111541

Further sync with libapr constants changes:
- the constants
  APR::(READ|WRITE|CREATE|APPEND|TRUNCATE|BINARY|EXCL|BUFFERED|DELONCLOSE)
  now have a prefix APR::FOPEN_ and moved group s/filemode/fopen/
- constants from the fileprot group moved to the fprot group and the
  prefix has changed: from APR::FILEPROT_ to APR::FPROT_
- this also fixes the import of APR_EXCL as an error constant