Use multiple argument form of system
brew-test-bot: use multiple argument form of system
brew-test-bot: use Dir[] for globbing
czmq: add :build to autotools dependencies

Closes #30325.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
pianobar 2014.06.08

Closes #30315.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
powerdns recursive server 3.6.0

Closes #30319.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Formula equality reflects the active spec
Pass the requested spec into the formula instance
Decouple spec selection from ARGV
Remove ARGV.filter_for_dependencies