BUG: Revert #10229 to fix DLL loads on Windows. #11493
Merged
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Backport of #11449.
Numpy wheels on Windows were clearing the ctypes path when they loaded
the OpenBLAS DLL, leading to failure of DLL loads subsequent to NumPy
import because the needed DLLs could not be found.
This isn't a straight revert, it restores to the 1.15.x version of
the relevant code.
Closes #11431.