gcutil 1.8.2

Closes #20907.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
imagemagick: fix test on <= 10.6
doctor: don't pass pathnames to Formula.factory

Fixes #20908.
Do this in a saner way
ruby-install 0.2.1

Closes #20914.

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