bug#10733: 24.0.93; w32 file truncation

[Eli Zaretskii]

> From: Lennart Borgman <lennart.borgman@gmail.com>
> Date: Mon, 6 Feb 2012 21:23:20 +0100
> Cc: eliz@gnu.org, ofv@wanadoo.es, lekktu@gmail.com, 10733@debbugs.gnu.org
> 
> To me it seems quite scary that Emacs has its own implementation of
> such low level functions.

Don't worry: `stat' is a low-level function on Posix platforms, but
not on Windows.

w32.c is full of such "low-level" functions, reimplemented to be more
Posix like, because MSVCRT does a very poor job in that regard, and
Emacs expects Posix-compliance in quite a few places.