As of CMake 3.20.1, `-rpath` is being added to the linker command when targeting all Apple platforms. However, `ld` will return an error when `-rpath` is combined with `-mmacosx-version-min=10.4`. The pre-3.20.1 behavior should be restored when targeting Mac OS 10.4 and earlier. Downstream report: https://trac.macports.org/ticket/63261