libredirect: build fat library for x86_64, arm64, arm64e on darwin (#153441)
libredirect: build fat library for x86_64, arm64, arm64e on darwin (#153441)

macOS's dyld can be rather picky as to what dylib it accepts. This
even changes across macOS versions. Therefore we now build a fat
dylib with all three architectures (x86_64, arm64, arm64e). This
should then be compatible with pretty much any macOS's dyld.
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