Don't create links to non-existent dependencies

JsonCpp isn't used any more and Boost is linked statically now, so
SLPlugin doesn't need to link to any Boost dynamic libraries upwards
(which are of an older version and are there because they're still
needed by Collada DOM).
I suspect links to non-existent files have been the cause of why
Gatekeeper just wouldn't identify the developer despite the fact
that Apple notarisation service would still accept the bundle and
various Apple's integrity (command-line) tools would still validate
the bundle too.
This commit also removes unnecessary linkage changes for the media
plugins.

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