am 8b70e8c6: use minigzip instead of system gzip in the build

Merge commit '8b70e8c6574e6e6e80aaa84fe1a9426995fa0a78'

* commit '8b70e8c6574e6e6e80aaa84fe1a9426995fa0a78':
  use minigzip instead of system gzip in the build