Fix macOS and binutils>=2.29 support#7

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Commits on Jan 28, 2021

Added instructions on installing requirements for macOS
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Fixed issue with missing function prototypes for binutils >= 2.29 on macOS
ellie-ivision
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Fixed macOS support by adding newer homebrew path for binutils, removing the platform prefix in libiberty, and linking against libz
ellie-ivision
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