internal/rosa: lazy initialise all artifacts

This improves performance, though not as drastically as lazy initialising llvm.

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

internal/rosa/musl.go

@@ -42,7 +42,7 @@ rmdir -v /work/lib
 	}
 
 	return t.New("musl-"+version, stage3Concat(t, attr.Extra,
-		t.NewMake(),
+		t.Load(Make),
 	), nil, slices.Concat([]string{
 		"ROSA_MUSL_TARGET=" + target,
 	}, attr.Env), `