Homebrew/homebrew — pull request #34397 by mikemcquaid (2014-11-23 13:43:53+00:00)
Title: formula_installer: don't always post_install.

We don't want to do so when building bottles or we can end up with some weird stuff being bottled unintentionally (and it'll run twice; once before bottling, once afterwards).

CC @jacknagel for thoughts on this as you mentioned it before.

Fixes #34349.