Merge pull request #2139 from fredrik-johansson/sinc #187

Job	Run time
GCC build regression check (no tests)	1m 21s
macOS-M1, Clang (x3)	8m 9s
MinGW GCC (x0.5)	10m 48s
MSVC (x1)	26m 37s
Ubuntu Clang, BLAS and examples (x5)	12m 42s
Ubuntu GCC, Code Coverage (x10)	29m 0s
Ubuntu GCC with NTL (assert, x2)	8m 9s
Alpine Linux, musl, 32-bit (assert, x1.5)	14m 10s
Nemo.jl	17m 19s
	2h 8m 15s

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