CMake: Use imported targets for PkgConfig packages (#954)

This carries include directories and the required link flags.
Several libraries brought in through pkg_check_modules aren't linked correctly using the _LDFLAGS variables.
Instead, they link the libraries directly with `-l`.
This is problematic because it doesn't properly pull in the actual directory of the library being linked when it is not in a system library directory.
Likewise, the necessary include directories for several of these targets aren't properly set either.
Linking against the imported targets automatically pulls in the necessary include directories.

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