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Fixes #622
(as well as gqrx-sdr/gqrx#570 and gqrx-sdr/gqrx#1191).
The
sqrtf
ORC instruction is dangerous, because on at least one platform (ARM) it produces sqrt(0) = NaN.@jdemel suggested in #640 that we remove affected kernels completely, so I've done that here. This may potentially reduce performance on platforms other than x86 & ARM, but it's probably worth it to not have incorrect output on ARM.
There are a couple other unused kernels that also have the
sqrtf
instruction, but they will be removed in #638.