patch: support sal-fft

[Stefan Seefeld]

The attached patch adds support for SAL as a new backend for our FFT engine.
This new backend does not support 3D ffts, and block sizes that are not powers of two.
I therefor (conditionally) masked those tests in tests/fft.cpp that SAL does not
support. This can be reverted as soon as the fft_dispatch framework is in place,
i.e. multiple fft backends are supported in parallel.

I believe the code in src/vsip/impl/sal/fft.h can be tidied up quite a bit,
though I'd prefer to do that only once the code is refactored, i.e. for now
focus on feature completeness.

Regards,
		Stefan
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