build(deps): support universal builds on macOS

CMake can handle building universal binaries on macOS using the
`CMAKE_OSX_ARCHITECTURES` variable. Let's pass this variable to the
relevant dep builds. We use the `LIST_SEPARATOR` argument to prevent the
shell from interpreting the `;` that CMake uses as a list separator.

For dependencies that don't build using CMake, we only need to make sure
that the compiler is invoked with the correct `-arch` flags. The
compiler does the rest.

The only exception to this is the LuaJIT build, which we handle
separately as a special case.

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