gd: update url

Closes #19578.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
unar 1.6

Closes #16276.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Libvirt 1.0.5

Closes #19579.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
--env: show HOMEBREW_CC in superenv

Closes #18247.
atari++ 1.71

Closes #17766.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
brew-test-bot: force checkout master with cleanup.