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Correct build error and AM amplitude error #1

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erikkaashoek
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The calculated amplitude of the AM modulation seems wrong. When I change in ad9910.cpp the amplitude calculation to:
Amplitude_AM = MaxAmplitudeValue * (1+Sin*AM_DEPH/100.0) / (1 + AM_DEPH/100.0);
The measured AM modulation depth agrees better with the set value.
Please ignore the other changes. They where needed for my build environment.

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