HaikuImage and enabled individually using the
AddOptionalHaikuImagePackages rule or all at once by setting
HAIKU_ADD_ALL_OPTIONAL_PACKAGES. In principle an optional package can
be any kind of addition to the Haiku image, but usually a zip file will
be downloaded from somewhere and unzipped onto the image. I've added a
WonderBrush package as an example.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22184 a95241bf-73f2-0310-859d-f6bbb57e9c96