[PD] Rounding errors appear only in Windows

[Roman Haefeli]

Hey all

I finally figured out some bug in netpd that looked platform dependent.
It turns out it actually is platform dependent. I do something that
only creates rounding errors on Windows (or Wine), but not on Linux or
macOS. 

Attached patch illustrates the issue. It pre-calculates a look-up
table. The resulting values in the table are slightly different between
platforms. On Linux, I get only integer values between 0 and 255, while
on Windows get some values like 8.99996 or 256. 

Assuming, that the code for [*~ ], [/~ ] and [phasor~ ] is the same on
all platforms, I wonder where the difference is coming from. Is Windows
simply less smart? Can this be fixed? Is there a cleaner way to do what
I want?

Roman
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