Improve autoconf-archive detection
Improve autoconf-archive detection

We don't require autoconf-archive on CentOS 6.

We can check more platforms, macOS with Homebrew and FreeBSD.

naoa/groonga,komainu8/groonga,groonga/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,naoa/groonga,naoa/groonga,kenhys/groonga,komainu8/groonga,kenhys/groonga,kenhys/groonga,kenhys/groonga,komainu8/groonga,kenhys/groonga,komainu8/groonga,naoa/groonga,naoa/groonga,groonga/groonga,komainu8/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga,naoa/groonga,groonga/groonga,kenhys/groonga,groonga/groonga,groonga/groonga,naoa/groonga,naoa/groonga,komainu8/groonga