pkgsMusl.haskell.compiler.ghc8102Binary: Fix musl segfault. Fixes #118731 #129247.

This commit replaces the musl + glibc hackery in the GHC bindist
compiler by using the new musl based bindist that GHC HQ provides
(built on Alpine).
We could alternatively also use a nix-built musl boostrap compiler,
but it seems nicer to use the GHC HQ one for now.

This fixes the compiler built by
`pkgsMusl.haskell.compiler.ghc8102Binary` segfaulting (#118731)
since the commit

    5e2311d2f - musl: 1.2.1 -> 1.2.2

concretely, musl commit

    01c7920f - remove redundant pthread struct members repeated for layout purposes

which I suspect breaks some glibc/musl ABI compatibility that may have
existed accidentally until then.

The added

    lib.optional stdenv.targetPlatform.isMusl "pie";

also fixes that the packaged bindist compiler cannot create a binary
in its `installCheck` phase (and overall); see detail explanation
in #129247.

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