Update and simplify cmake #151

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2 errors and 10 warnings

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'ducc0::detail_error_handling::CodeLocation': '4' bytes padding added after data member 'ducc0::detail_error_handling::CodeLocation::line'

'argument': conversion from 'int' to 'const unsigned __int64', signed/unsigned mismatch

'return': conversion from 'size_t' to 'ptrdiff_t', signed/unsigned mismatch

attribute [[gnu::hot]] is not recognized

'vlen': unreferenced formal parameter

'axis': unreferenced formal parameter

'ducc0::detail_fft::ExecDcst': '3' bytes padding added after data member 'ducc0::detail_fft::ExecDcst::ortho'

'ducc0::detail_fft::ExecDcst': '3' bytes padding added after data member 'ducc0::detail_fft::ExecDcst::cosine'

'finufftf_plan_s': '4' bytes padding added after data member 'finufftf_plan_s::ntrans'

'finufftf_plan_s': '4' bytes padding added after data member 'finufftf_plan_s::nbatch'