Use the Interleaved Complex API introduced in Matlab R2018a if available

[wahls]

This would make calling mex files more efficient as the conversion to the complex array layout where real and imaginary parts are separated could be skipped.

https://nl.mathworks.com/help/matlab/matlab_external/matlab-support-for-interleaved-complex.html https://nl.mathworks.com/help/matlab/matlab_external/upgrade-mex-files-to-use-interleaved-complex.html