Refactor buildComponent and replComponent (haskell#9475)

This is a pure refactor that reduces code duplication, with the
exception that it also fixes a bug in that `preprocessExtras` was
not being called for foreign libraries in both functions.

Co-authored-by: Rodrigo Mesquita <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>