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math/blas, math/lapack: Install interchangeable BLAS system

Install the new interchangeable BLAS system created by Thomas Orgis,
currently supporting Netlib BLAS/LAPACK, OpenBLAS, cblas, lapacke, and
Apple's Accelerate.framework.  This system allows the user to select any
BLAS implementation without modifying packages or using package options, by
setting PKGSRC_BLAS_TYPES in mk.conf. See mk/blas.buildlink3.mk for details.

This commit should not alter behavior of existing packages as the system
defaults to Netlib BLAS/LAPACK, which until now has been the only supported
implementation.

Details:

Add new mk/blas.buildlink3.mk for inclusion in dependent packages
Install compatible Netlib math/blas and math/lapack packages
Update math/blas and math/lapack MAINTAINER approved by adam@
OpenBLAS, cblas, and lapacke will follow in separate commits
Update direct dependents to use mk/blas.buildlink3.mk
Perform recursive revbump

Update math/lapack and math/blas to v3.9.0

Have switched to the CMAKE build and enabled tests.
make test passes all (with one patch pushed upstream)

Package additions, from the release notes are:

LAPACK 3.9.0
   LAPACK QR
      preconditioned QR SVD method for computing the SVD with high accuracy,
      by Zlatko Drmac

   LAPACK Householder Reconstruction
      by Igor Kozachenko and Jim Demmel

LAPACK 3.8.0
   Symmetric-indefinite Factorization: Aasen’s tridiagonalization 2 stage
      A contribution from Ichitaro Yamazaki (University of Tennessee).

   LAPACKE interfaces
      A contribution from Julie Langou (University of Tennessee).