When using `install`, CMake will fix up a binary's rpath entries
automatically. As `install` is also used to copy all build artifacts
into a common runtime directory, this will lead to independent binaries
such as "obs-ffmpeg-mux" to be fixed up to run within a fully portable
app bundle.
Yet during development, the app bundle is not fully portable, so rpath
entries to e.g. libobs need to be retained. Using CMake's
`install PROGRAMS` variant will achieve just that.
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