[3.7] bpo-32647: Link ctypes extension with libdl. (GH-5550) (#5874)

The ctypes module used to depend on indirect linking for dlopen. The shared
extension is now explicitly linked against libdl on platforms with dl.

Signed-off-by: Christian Heimes <christian@python.org>
(cherry picked from commit 5bb9692575f10f4a7c7f1c2c0c70956baf6d5c23)

Co-authored-by: Christian Heimes <christian@python.org>
2 files changed