w32-focus-frame should not raise frame on Windows

[Drew Adams]

w32-focus-frame always raises the frame. The doc string says "Give
frame input focus, raising to foreground if necessary."

I don't see why Emacs or Windows (who decides?) thinks it is
necessary.

I cannot find any way, in Windows, to just move the focus to the frame
where the mouse is, without also raising the frame. Kevin Rodgers and
I spent a while trying to figure out how to do that, to make his
follow-mouse.el library work on Windows, but to no avail.

In GNU Emacs 22.0.50.2 (i386-mingw-nt5.1.2600)
 of 2005-04-16 on LAPTOP
Distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'