[Octave-bug-tracker] [bug #50463] gsvd implementation uses functions removed from lapack >= 3.6.0

[Mike Miller]

Follow-up Comment #5, bug #50463 (project octave):

Not saying this is a bad change, but this has a possibility of unintended
consequences. Until now, Octave was built against the BLAS / LAPACK stable API
that hasn't changed in decades. One could build Octave against standard BLAS
and LAPACK, and then switch to either ATLAS or OpenBLAS at run time.

If this change is applied, it's possible to build Octave against an old BLAS /
LAPACK, and then try to use OpenBLAS at run time, which may exhibit the same
run time error. Or it may be possible to build Octave against a LAPACK that
does have the xGGSVD3 functions, and switch to a different one at run time
that doesn't, resulting in a similar run time error.

On my system, NETLIB, ATLAS, and OpenBLAS all have the xGGSVD3 functions, and
I don't know how likely it is to find a system that has a mix of libraries
with and without this function, but it's possible.

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