K 10
svn:author
V 6
pkubaj
K 8
svn:date
V 27
2020-06-04T11:37:24.403030Z
K 7
svn:log
V 323
math/openblas: fix build on powerpc

Merge upstream commit to fix build on powerpc.
Use GCC from ports to build it.
Since this is mostly about G3 and G4 machines that users have and OpenBLAS supports only G4 of those, target G4.
Due to some (still unknown) regression on head, this builds on 12.1, but fails tests on head.

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