winemenubuilder: Add support for 24 and 32 bit icons using png format.

[Vitaliy Margolen]

Dan Kegel wrote:
> Your patch applies and creates .png icons...
> But it seems to create the icons with two suffixes, e.g. file shows
>   a680_forum.png.xpm: PNG image data, 32 x 32, 8-bit/color RGB, non-interlaced
> Shouldn't that just be .png, not .png.xpm?
> 
> (This is for http://bugs.winehq.org/show_bug.cgi?id=4803 )

Where are seeing that file? Also are you sure you are using patches 
wineshelllink? That's what copies the icon from c:\windows\temp to 
~/.local/share/icons

Vitaliy.