WIP, BLD: PYTHONSAFEPATH support #24944
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Fixes BUG: failed to build with
PYTHONSAFEPATH=1environment variable #24907marked as WIP (and CI skipped) for now because this is ugly and we could also just decide not to fix it at all, and/or to error out when that env var is set with a clear error message
we can avoid
PYTHONSAFEPATHcausing our build to choke on the fact that the NumPy build requires Python code to execute an "unsafe" import from its own build dirhere, the chosen approach is to perform the import "manually," but we could also decide to refuse to build if that environment variable is set for example, depending on our view on the matter
[ci skip] [skip cirrus]