Add support for `spreadinterponly` in finufft #500

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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

'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 '..'