Win32: Improve apr_file_gets() performance on buffered files by not calling

apr_file_read() on each byte.

The benchmark shows that this makes the function roughly 4 times faster:

  4.202 ms -> 1.042 ms   (I measured multiple calls for the same test file)

Also see https://svn.apache.org/r65294

* file_io/win32/readwrite.c
  (apr_file_read): Factor out the part of this function that handles
   reading from buffered files ...
  (read_buffered): ...into this new helper.
  (apr_file_gets): Use the buffer directly for buffered files, the same
   way as in the Unix implementation.

* test/testfile.c
  (test_gets, test_gets_buffered): Extend these tests with read-after-EOF
   checks.
  (test_gets_empty, test_gets_multiline, test_gets_small_buf,
   test_gets_ungetc, test_gets_buffered_big): New tests.
  (testfile): Run the new tests.

Patch by: Evgeny Kotkov <evgeny.kotkov {at} visualsvn.com>


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1785072 13f79535-47bb-0310-9956-ffa450edef68

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