internal/rosa: gzip artifact

Toybox does not implement this, and it is used by many programs, including toybox itself.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/toybox.go

@@ -10,6 +10,7 @@ func (t Toolchain) newToybox() pkg.Artifact {
 	return t.New("toybox-"+version, false, stage3Concat(t, []pkg.Artifact{},
 		t.Load(Make),
 		t.Load(Bash),
+		t.Load(Gzip),
 
 		t.Load(KernelHeaders),
 	), nil, stage3Concat(t, []string{},