Debug Flag on AMD systems

MKL libraries are known to be hampered on AMD processors.
There appears to be a undocumented environment flag to improve on that, for now, as seen here:
https://www.pugetsystems.com/labs/hpc/How-To-Use-MKL-with-AMD-Ryzen-and-Threadripper-CPU-s-Effectively-for-Python-Numpy-And-Other-Applications-1637/

The VML documentation is
https://software.intel.com/en-us/mkl-macos-developer-guide-setting-the-default-mode-of-vector-math-with-an-environment-variable

I am currently lacking the time implement and the AMD system to test but putting here for reference.