currently openblas's spkg-configure.pc unconditionally makes cblas.pc and lapack.pc copies of openblas.pc, which in some cases if incorrect, e.g. Arch Linux has libcblas linked to libopenblas
and containing stuff missing in libopenblas, resulting in errors.

this has been reported on sage-devel
https://groups.google.com/d/msg/sage-devel/pIOnFyFJMtM/_FbzM2OxCQAJ

So we should make these installations conditional.

Depends on #29051

CC: @isuruf @mkoeppe @antonio-rojas

Component: build: configure

Author: Dima Pasechnik

Branch/Commit: 3a4524e

Reviewer: Isuru Fernando, Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/29071