depends_on :formula should take install flags

[vitorgalvao]

Refs #8784.

We need to both add the option to supply install flags and a way to check if the relevant formula was compiled with the relevant flags (since it currently only checks if it was installed at all).

Also

Each depends_on stanza may only contain one of:

• :formula with optional :options (and any future args such as :version)
• :cask with optional :options (and any future args such as :version)
• :macos
• :arch
• :x11
• :java

It would look something like

depends_on :formula => 'mkvtoolnix'
depends_on :formula => 'ffmpeg',
           :version => '>= 2.5.2',
           :options => %w{ --with-faac --with-fdk-aac }

Also, perhaps we will be able to leverage this directly from homebrew, with the merger.

[vitorgalvao]

There was a single group of casks that benefited from this, and we don’t have them anymore. This isn’t as necessary as originally thought. Closing.