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

["James Canete" <use_less@xxxxxxxxxxx>]

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

Thanks to the changes in the common drawing code, some of the sprite
drawing functions in graphics.c have unnecessary parameters.  This patch
renames two functions, removes parameters, and removes one function.  It
also fixes a bug where the fog bitmap was not made if the initial
tileset is non-isometric, which prevents fog from being drawn if the
tileset is then changes to an isometric set.

-James Canete

win32-cleanupgraphics.diff
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