Add a patch to explicitly link against libfplib.so.

What the port was doing was never right, but the upcoming CMake 3.5.0 makes the
build failures happen more often.

Using target_link_libraries() with a name like fplib will just pass -lfplib to
the linker instead of declaring a dependency between the lastfm-fpclient and
fplib_shared targets and parallel builds may break.

PR: 208033