* InstallOptionalHaikuImagePackage: Made the first argument an actual file
name, i.e. the extension ".zip" is no longer appended by it.
* Renamed rules UnzipArchiveTo{Container,HaikuImage} to
ExtractArchiveTo{Container,HaikuImage} and generalized them to support
tgz/tar.gz archives (implemented in build_haiku_{image,cd}).
* Removed DownloadOptionalPackage. DownloadFile is used instead.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35634 a95241bf-73f2-0310-859d-f6bbb57e9c96