[PR] apr_file_pipe_create() - save more syscalls wit h pipe2() [apr]

notroj opened a new pull request, #56:
URL: https://github.com/apache/apr/pull/56

   ```
   * file_io/unix/pipe.c (file_pipe_create): Use pipe2(,O_NONBLOCK) by
     default unless APR_FULL_BLOCK was used; unconditionally set the
     blocking state later. Saves two syscalls per invocation for both
     APR_READ_BLOCK and APR_WRITE_BLOCK, no [intended] functional change.
   ```


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