Summary:
As a result of fixing #8935 we needed to open shared libraries
with RTLD_LOCAL and so symbols from packages loaded earlier
cannot be found anymore. We need to include in the link all
packages loaded so far.

This fixes #10058

Test Plan: validate

Reviewers: hvr, simonmar, austin

Reviewed By: austin

Subscribers: rwbarton, thomie

Differential Revision: https://phabricator.haskell.org/D676

GHC Trac Issues: #10058