Add deps/install/lib to RPATH and warn user when using dynamic libs. (#4684)
Installing the cvc4 binary does not work right now if it links against a shared library obtained via one of the contrib scripts.
This PR thus adds deps/install/lib to the RPATH so that the installed binary works at all in this case.
This change however paves the way to more problems: If one install such a dynamically linked binary and then removes (or updates) one the shared libraries in deps/install/lib, the installed binary most probably stops working.
Hence, this PR checks whether this may happen (whether we link dynamically and link against a shared library from deps/install/lib) and, if this is the case, informs and warns the user about this issue.
If the user tries to install to the default install prefix (/usr/local) we disallow installation entirely.
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