bug#14821: Build broken on 64-bit Cygwin starting with bzr revision 113315

[Eli Zaretskii]

> Date: Tue, 09 Jul 2013 12:46:44 -0400
> From: Ken Brown <kbrown@cornell.edu>
> CC: 14821@debbugs.gnu.org, eggert@cs.ucla.edu
> 
> the symbol 'setmode' is no longer exported in 64bit Cygwin.

Are you saying that there's no way of reading files in text mode while
removing CR characters from CR-LF pairs?

> That's 
> what caused the build failure.  And the code in pipe2.c that calls 
> setmode should never actually get executed on Cygwin anyway because of this:
> 
>          int result = pipe2 (fd, flags);
>          if (!(result < 0 && errno == ENOSYS))
>            {
>              have_pipe2_really = 1;
>              return result;

So define setmode away for Cygwin versions that don't have it.  Not
everyone runs the bleeding edge.