bug#7716: 23.2.91; Pretest Windows binary doesn't support PNG images

[Drew Adams]

>   emacs -Q
>   (image-type-available-p 'png) => t
>   C-x C-f some-file.png RET => no image displayed, only an empty box.

Using the binary created by Sean for the pretest, I get:

(image-type-available-p 'png) => nil

And when I visit a .png file I see text coding.

HTH - Drew

In GNU Emacs 23.2.91.1 (i386-mingw-nt5.1.2600)
 of 2010-12-11 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4) --no-opt --cflags
-Ic:/imagesupport/include'