Build with System OpenSSL on Mac OS arm64 (#31096)
Build with System OpenSSL on Mac OS arm64 (#31096)

* fix: grpcio fails to build from source on Apple Silicon mac #(25082)

Boringssl currently does not support macOS arm64, so installation on these platform with default config will undoubtedly fail, that means the env var 'BUILD_WITH_SYSTEM_OPENSSL' must be set to true.

* Use system installation of openssl by default on macOS arm64

* Format code by yapf
stanley-cheung/grpc,grpc/grpc,stanley-cheung/grpc,jtattermusch/grpc,grpc/grpc,jtattermusch/grpc,stanley-cheung/grpc,stanley-cheung/grpc,grpc/grpc,stanley-cheung/grpc,grpc/grpc,grpc/grpc,stanley-cheung/grpc,jtattermusch/grpc,stanley-cheung/grpc,grpc/grpc,grpc/grpc,grpc/grpc,jtattermusch/grpc,stanley-cheung/grpc,jtattermusch/grpc,stanley-cheung/grpc,stanley-cheung/grpc,jtattermusch/grpc,jtattermusch/grpc,jtattermusch/grpc,grpc/grpc,grpc/grpc,jtattermusch/grpc,grpc/grpc,stanley-cheung/grpc,jtattermusch/grpc,grpc/grpc,jtattermusch/grpc,jtattermusch/grpc,stanley-cheung/grpc