Remove ORC from the brewfile [skip ci]

cpp/Brewfile

@@ -25,14 +25,12 @@ brew "double-conversion"
 brew "flatbuffers"
 brew "git"
 brew "glog"
-brew "google-benchmark"
 brew "grpc"
 brew "llvm@7"
 brew "lz4"
 brew "ninja"
 brew "numpy"
 brew "openssl"
-brew "orc"
 brew "protobuf"
 brew "python"
 brew "rapidjson"