Use brew volk package on MacOS instead of source build

[dh1tw]

Recent versions of cmake require cmake_minimum_required(VERSION) to be higher than 3.5. Almost all CMakeLists.txt are already at VERSION=3.12. I found two more CMakeLists.txt where cmake_minimum_required had to be bumped to 3.12.

Volk can now be installed on MacOS with the Homebrew package manager. No more manual compiling needed. I updated the readme accordingly.

[AlexandreRouma]

Recent versions of cmake require cmake_minimum_required(VERSION) to be higher than 3.5. Almost all CMakeLists.txt are already at VERSION=3.12. I found two more CMakeLists.txt where cmake_minimum_required had to be bumped to 3.12.

Please PR to upstream instead:

• https://github.com/quiet/libcorrect
• https://github.com/discord/discord-rpc

Volk can now be installed on MacOS with the Homebrew package manager. No more manual compiling needed. I updated the readme accordingly.

I can't test right now as I don't have a mac to validate that this is the case. Please edit the PR to only keep this change and I'll only merge once I can check first hand that the brew version works properly.

[dh1tw]

Thanks for the swift feedback. I just opened the PRs as suggested in the upstream repos, but I doubt that they will ever get merged. There hasn't been any activity in these repos for more than 5 years.

Sure, I can remove the edit to the CMakeLists.txt.

Would you prefer to add note in the readme.md that for modern versions of cmake, the flag -DCMAKE_POLICY_VERSION_MINIMUM=3.5 needs to be set?

Here is the link to the volk homebrew formula.