Instantiated libraries (Backpack) don't get linked with enough deps

One downstream instance of this reported at https://github.com/haskell/cabal/issues/4755

Basically, if you instantiate a library q with library p, you need to make sure libHSp.so shows up in its linker dependencies. This is not the case right now.

Patch coming (I filed this to get a bug number :)

Trac metadata

Trac field	Value
Version	8.2.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Linking)
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