[CM] s7_complex does not compile for MSVC

[Da Shen]

Here are the related code snippets:
#if S7_WITH_COMPLEX_VECTORS
 #if __cplusplus
 #include <complex>
 typedef std::complex<s7_double> s7_complex;
 #else
 #include <complex.h>
 typedef double complex s7_complex;
 #endif
#endif
see https://learn.microsoft.com/en-us/cpp/standard-library/complex?view=msvc-170 <https://learn.microsoft.com/en-us/cpp/standard-library/complex?view=msvc-170 >
And here is the failed github action:
https://github.com/LiiiLabs/goldfish/actions/runs/11904848843/job/33174341096?pr=164 <https://github.com/LiiiLabs/goldfish/actions/runs/11904848843/job/33174341096?pr=164 >
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