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[Lapack] Patches to test suite of BLAS for LAPACK-3.4.0

Hi,

some tests of the BLAS fail on Intel and AMD processors when
compiling with high optimization level (e.g. gfortran -Ofast).
The reason is that the determination of machine precision in
these tests only works without optimization.

I recommend to always use the Fortran 90+ intrinsic EPSILON()
where appropriate.

See the attached for details.

Regards,
Harald
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