Add support for `spreadinterponly` in finufft #500

Annotations

10 warnings

Compiler will insert Spectre mitigation for memory load if /Qspectre switch specified

Compiler will insert Spectre mitigation for memory load if /Qspectre switch specified

Compiler will insert Spectre mitigation for memory load if /Qspectre switch specified

Compiler will insert Spectre mitigation for memory load if /Qspectre switch specified

'finufft_opts': '4' bytes padding added after data member 'finufft_opts::spread_kerpad'

'XSIMD_WITH_FMA3_SSE' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif'

'XSIMD_WITH_FMA3_AVX' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif'

'XSIMD_WITH_FMA3_AVX2' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif'

'XSIMD_WITH_AVX512' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif'

relative include path contains '..'