integration: removed Opts.Archiver.
integration: removed Opts.Archiver.

Opts.Archiver argument was always unused and recently removed.

rminnich/u-root,hugelgupf/u-root,GanShun/u-root,u-root/u-root,u-root/u-root,GanShun/u-root,GanShun/u-root,rminnich/u-root,hugelgupf/u-root,hugelgupf/u-root,rminnich/u-root,hugelgupf/u-root,u-root/u-root,rminnich/u-root