extra-bundled-libraries shouldn't use hsLibraries

[bgamari]

Describe the bug
In GHC#22564 we noted that users of Cabal's extra-bundled-libraries field are saddled with the unfortunate requirement of naming their native libraries with a rather ad-hoc libC prefix (specified in the Cabal reference documentation).

This requirement is due to the strange implementation of extra-bundled-libraries: "bundled" libraries are added to the hsLibraries field of InstalledPackageInfo, leaving GHC's runtime linker with an ambiguity regarding whether the library is a Haskell object (in which case it may need a "way" suffix in its name) or native object. The required libHS/libC prefix exists merely to allow the linker to resolve this ambiguity.

IMHO it would be much better if extra-bundled-libraries were instead implemented in terms of a new InstalledPackageInfo field, eliminating the ambiguity by construction.

(this was originally filed as GHC#22732

[Mikolaj]

I assume GHC is ready for this change (since which version? do we need any hacks backward compatibility?) so PR is welcome and can be immediately tested.