Update build settings to support Apple M1#91

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jpc wants to merge 3 commits intoanthonygelibert:masterfrom

Commits on Sep 27, 2021

Look for boost in /opt/homebrew/include (the default Homebrew path on Apple M1)
jpc
committed
Overwrite Lua compilation flags (clang does not like -march=native on Apple M1)
jpc
committed
Enable universal (arm64/x86_64) builds for Lua and Highlight
jpc
committed