copy: Take into account extra-dyn-lib-flavours when copying bundled library

[mpickering]

This fixes the DynWay case to match the other cases which take into account extra-dyn-lib-flavours.

[geekosaur]

[__1] next goal: cabal-testsuite:setup.Cabal (dependency of cabal-testsuite)
[__1] rejecting: cabal-testsuite:setup.Cabal-3.13.0.0 (conflict: cabal-testsuite => cabal-testsuite:setup.Cabal>=3.10 && <3.11)

Didn't we already fix this once? (Also, since Cabal 3.12 is now released, should custom-setup use it instead of 3.10?)