Revert "travis: try to build on OS X"
Revert "travis: try to build on OS X"

This reverts commit 9ac9b188c06ae28b81a6710a245f1a36031b6360.

It's not available yet.

cosmo0920/groonga,komainu8/groonga,hiroyuki-sato/groonga,naoa/groonga,naoa/groonga,redfigure/groonga,redfigure/groonga,cosmo0920/groonga,naoa/groonga,kenhys/groonga,komainu8/groonga,redfigure/groonga,hiroyuki-sato/groonga,naoa/groonga,kenhys/groonga,groonga/groonga,hiroyuki-sato/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,komainu8/groonga,groonga/groonga,hiroyuki-sato/groonga,kenhys/groonga,redfigure/groonga,redfigure/groonga,cosmo0920/groonga,redfigure/groonga,groonga/groonga,cosmo0920/groonga,cosmo0920/groonga,komainu8/groonga,hiroyuki-sato/groonga,kenhys/groonga,naoa/groonga,komainu8/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,cosmo0920/groonga,naoa/groonga,naoa/groonga,komainu8/groonga,hiroyuki-sato/groonga,kenhys/groonga,redfigure/groonga,naoa/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga,redfigure/groonga,hiroyuki-sato/groonga,groonga/groonga,komainu8/groonga,groonga/groonga,cosmo0920/groonga,groonga/groonga