fix decode-data for indexed-colour images #7
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* We were calling unfilter-scanlines with a pixel size of 4 (bytes). In fact, indexed-colour pixel sizes are 1 byte. Fix unfilter-scanline call appropriately.
* and move the compiler-macro too. this has the effect of defining the compiler-macro in time to be used by the compiler, and eliminates warnings when compiling.
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4 (bytes). In fact, indexed-colour pixel sizes are 1 byte. Fix
unfilter-scanline call appropriately.