OpenBLAS patch for Cygwin

[Erik Bray]

Hello,

Users/maintainers of OpenBLAS on Cygwin may be interested in this
patch to improve support for fork():
https://github.com/xianyi/OpenBLAS/pull/1450

Assuming this looks good (feedback welcome) it might be nice to have
this patch included in the next release of the official OpenBLAS
package for Cygwin since its incompatibility with fork() has caused
problems in the past [1].


Thanks,
E

[1] https://trac.sagemath.org/ticket/22822

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