message: Curl buildifier binary instead of installing go 1.8
diff: #!/bin/bash -e
  # buildifier
  -export GOPATH=/usr/lib/go
  -go get github.com/bazelbuild/buildifier/buildifier
  +curl --location --output /usr/local/bin/buildifier https://github.com/bazelbuild/buildtools/releases/download/0.11.1/buildifier \
  + && echo 'd7d41def74991a34dfd2ac8a73804ff11c514c024a901f64ab07f45a3cf0cfef /usr/local/bin/buildifier' | sha256sum --check \
  + && chmod +x /usr/local/bin/buildifier
  # GCC for everything.
  export CC=gcc
  