RFA: Various Windows (mingw32) additions, mostly relating to select or serial ports

[Mark Kettenis]

> Date: Thu, 9 Feb 2006 17:38:32 -0500
> From: Daniel Jacobowitz <drow@false.org>
> 
> Here's a version that puts gdb_select off in its own file, and uses it
> everywhere that it can be used (which does not include ser-tcp.c,
> sorry).

It's a pity ser-tcp.c can't use it.  Can you add a comment explaining
why?  Otherwise, this looks fine to me (and the safe_strerror patch
looks fine too).  Thanks for doing this.

Mark