* hacky/mumps-mkl.scm (mumps-mkl): Use ‘intel-oneapi-mkl’ instead of
‘mkl’.
* hacky/suitesparse-mkl.scm (suitesparse-mkl): Likewise.
* inria/makutu.scm (block-row-mv+mkl): Likewise.
* inria/tainted/solverstack.scm (chameleon+mkl+mt, chameleon+mkl)
(pastix-mkl-5, pastix-mkl-6, blaspp-mkl, lapackpp-mkl)
(fabulous-mkl): Likewise.
(mkl2019-instead-of-mkl): Remove.
(mkl-instead-of-openblas-and-lapack): Change ‘mkl-2019’ to
‘intel-oneapi-mkl’.
(fmr, fmr+mpi, cppdiodon, cppdiodon+mpi, python-cppdiodon): Likewise.
(python-numpy-mkl): Likewise.