Fix: Set proper Homebrew install location for x86 Macs

[cnatale]

Description

During my setup of Localai, I ran into problems related to the llama CMakeLists.txt not having a reference to the Homebrew install location for Intel Macs. This pr fixes the problem, while maintaining the Homebrew install location for arm64 Macs.

See https://www.reddit.com/r/MacOS/comments/jw9guu/why_did_homebrew_move_from_usrlocalto_opthomebrew/ for more info.

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[mudler]

good catch, looks good here, thank you @cnatale !

[dave-gray101]

Nice fix!
I believe this may be related to some of the CI vs Local OSX problems I've been having of late - the github CI runners use "Macmini6,2" hardware as of writing this comment, which is Intel --- and all my prior testing was on an M1. I believe this could be the cause of some of the linking errors I had been seeing over the holidays, and was why I was experimenting with always rebuilding gRPC on CI for so long...