[patch, libfortran] PR32784 CONIN$, CONOUT$, and CONERR$ for Cygwin and mingw

[Jerry DeLisle]

The attached patch provides mapping the special file names to standard IO.  This 
is an extension requested quite a ways back.

Applied and tested / regression tested on Cygwin running on WinNT workstation. 
I do not have a working mingw set-up and would much appreciate someone building 
and testing for that system.

OK for trunk if so tested and passes?

Regards,

Jerry

2009-06-13  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	* io/unic.c (open_external): Translate CONIN$, CONOUT$, and CONERR$ to
	stdin, stdout, and stderr for ming32 or cygwin systems.


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