[NFC][CMake] Explicitly link to MC when needed

These targets use `MCInst`, but don't explicitly link
to the library providing it (MC), and just rely on it
being pulled transitively through e.g. MCDisassembler,
but that only pulls includes, and does not link to it.

Case in point, when i add explicit destructor to `MCInst`,
defined in `.cpp`, these targets were failing to link.