Put a bunch of suggestions in post-install/post-uninstall hooks.

This covers a bunch of commands that might have to be run after "make
install".  ("might" - none are needed on OS X, for example, as it's a
different desktop and its dynamic loader doesn't have a cache that you
have to manually update whenever you install a new shared library.)

Change-Id: I21e1728bdde26a7ab1585fdfb54f63fdc1c25dd6
Reviewed-on: https://code.wireshark.org/review/5606
Reviewed-by: Guy Harris <guy@alum.mit.edu>