bug#63986: Julia is very slow

[Cayetano Santos]

> Looks like it should be "LIBBLAS=-lopenblas"
>
> It might need some tuning anyway, currently we have julia for i686 and
> switching to solely openblas-ilp64 we'd lose 32-bit support.
>
> I also noticed the julia expects the 64-bit openblas to be libopenblas64
> (which happens to be what Debian¹ has). Would we need to adapt anything
> in stdlib/OpenBLAS_jll/src/OpenBLAS_jll.jl?
>
> Also, are we supposed to build lapack with our openblas as an input?

Being used to Arch, it seems to me the way they do things is the way to
go, or at least, a good reference (other than the support for 32-bit)

https://archlinux.org/packages/?sort=&q=blas&maintainer=&flagged=
https://gitlab.archlinux.org/archlinux/packaging/packages/julia/-/blob/main/PKGBUILD

C.