build.sh does not detect newer Darwin versions

[bensig]

I have to set my OS_VER manually to get this to install on 12.1 - something is wrong with the logic in the build_darwin script.

[bensig]

EOSIO CDT 1.7.x is not available via brew either... so it makes it hard to build the contracts v.1.9.2 release.

Would be a really great idea to synchronize the versions of EOS, CDT, and CONTRACTS to make this easier for people.

[medivother]

I have the same problem with the syncronization of eos,cdt and eosio.contracts. To build eosio.contracts eosio.cdt v1.6 is required but I can't download it. Anyone who did it recently?
Thank you for your work
Francesco