fix grpc: support ubuntu 20.04, minor fixes for old version #46

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1 error and 6 warnings

Process completed with exit code 8.

Treating cmake as a formula. For the cask, use homebrew/cask/cmake or specify the `--cask` flag. To silence this message, use the `--formula` flag.

Treating ares as a formula. For the cask, use homebrew/cask/ares or specify the `--cask` flag. To silence this message, use the `--formula` flag.

cmake 3.30.5 is already installed and up-to-date. To reinstall 3.30.5, run: brew reinstall cmake

git 2.47.0 is already installed and up-to-date. To reinstall 2.47.0, run: brew reinstall git

krb5 1.21.3 is already installed and up-to-date. To reinstall 1.21.3, run: brew reinstall krb5

These files were overwritten during the `brew link` step: