SCALAPACK support in routine compute_amn_with_scdm of pw2wannier90

Nicola Spallanzanirequested to merge
nicspalla/q-e:devel-pw2w90-pzgeqpf into develop

SCALAPACK support in routine compute_amn_with_scdm of pw2wannier90: support allowed only for ScaLAPACK >= 2.1.0 or MKL >= 2020

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