BLD: use BUFFERSIZE=20 in OpenBLAS #17924
Merged
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Backport of #17759.
xref OpenMathLib/OpenBLAS#2970 where it was suggested to compile OpenBLAS with BUFFERSIZE=20 to revert the memory footprint to what it was in OpenBLAS 0.3.9 (we now use 0.3.12). This was done in MacPython/openblas-libs#46, and this PR uses it in NumPy.
xref issue gh-17674, gh-17684 which triggered the discussion.