[fpc-devel] patch for fixing bug 4117

[Dirk]

Hi,

attached is a patch from Juergen Rathlev which *should* fixes bug 4117 
and may fix 4234, too. It removes using of qword from fpreadpng.pp 
because qword seems to be buggy and may probably improve the performance 
of some functions, too, because it avoids redundant shifting operations.

Dirk Rathlev
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