Remove brew-mirror-check command

This command uses removed API and is thus broken. It can always be
retrieved from the git history.
Remove download_strategy from SoftwareSpec
Update method call
create: pull requires out of method
create: make conditional more obvious
Hoist assignment to simplify a conditional
pygobject3: added comment to clarify which tests are which.

Closes #26929.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
youtube-dl 2014.02.22.1

Closes #26928.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Update hercules.rb

Use needed compiler directive for latest compiler.
Only use this compiler directive for OS versions 10.9 or later. This may still cause problems if people have older compilers on newer OSes.
Add a comment and move the CPPFLAGS line to someplace more appropriate.
Passing -D_FORTIFY_SOURCE=0 disables buffer overflow protection.
hercules: add 3.09 bottle.