Support for Mac OS X 10.4 broken since v. 3.20

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

Edited Aug 02, 2021 by Brad King

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