[fpc-devel] Patch for fpreadpnm

[Colin Western]

The attach fixes two problems I found reading pnm files:
- RGB files were not being read correctly
- byte values of 255 were overflowing.
I have adjusted the colour scaling to be compatible with what happens 
for .BMP files. I have not been able to do much testing, as I am short 
of files to test, but it works for the file I originally had problems 
with at least.
Colin


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