bug#52001: numpy CPU dispatch probably prevents builds of python-numpy from being reproducible

[Ricardo Wurmus]

Numpy accelerates operations with native code.  Early in the build 
it probes the CPU / compiler for supported instruction extensions 
and then proceeds to build extensions for different features.  I’m 
guessing that this won’t work when building on older CPUs, so the 
results of two builds on different CPUs may differ.

It would be helpful if someone could confirm this by building 
numpy on an older CPU and then compare the build result with that 
provided by ci.guix.gnu.org.

--
Ricardo