[Freeciv-Dev] (PR#11260) win32: simplify sprite drawing functions

["James Canete" <use_less@xxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=11260 >

This patch adds to the previous one by removing the sprite cache and
replacing it with an hbitmap cache, and also implements better fog, much
like the GTK2 client.

I also removed some checks from crop_sprite(), as if they fail the
graphics will be messed up anyway.

I'll probably commit it after testing with/porting to the S2_0 branch.

-James Canete

win32-newfog.diff
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