[PATCH] For PR libstdc++/33203.

[Benjamin Kosnik]

> Is this approach OK.

Yes. Thanks.

> Danny Smith  <dannysmith@users.sourceforge.net>
> 
> 	PR libstdc++/33203
> 	* configure.host (error_constants_dir):  New variable,
> 	defaulting to os/generic.
> 	( mingw32*): Overide default.
> 	* configure.ac (ERROR_CONSTANTS_SRCDIR): New.
> 	* configure: Regenerate.
> 	* include/Makefile.am (host_headers): Add
> 	$(ERROR_CONSTANTS_SRCDIR)/error_constants.h .
> 	* include/Makefile.in: Regenerate.
> 	* include/system_error (enum posix_errno): Remove.
> 	Include <bits/error_constants.h, instead.
> 	* config/os/mingw32/error_constants.h: New.
> 	* config/os/generic/error_constants.h

Please check this in, after Roger Sayle checks in his darwin bits.

best,
benjamin