[CF-Devel] client 'configure' gives problems

[Scott MacFiggen]

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      * Tiles left in memory. When you walk towards a wall, the tile immediatly
     
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      preceeding the 'blackness' is repeated in there and we see no blackness.
     
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      This only seems to happen with walls.
     
     
This is fixed. Turns out it was a problem with both the pngximage
and sdl clients. 

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      Could someone please put these into the readme or something, I really
     
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      think we need to include these packages in the debian 'crossfire' package
     
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      along with other things like jpg support, so that debian users don't have
     
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      to spend hours searching for the right package for the job. mids could
     
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      you try and work out what packages we need?
     
     
Added stuff about SDL in the README.

	-Scott