internal/rosa: early toybox variant

This is a variant of toybox with unfinished tools enabled, for artifacts that will end up in a dependency loop without them.

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

internal/rosa/xz.go

@@ -9,6 +9,9 @@ func (t Toolchain) newXZ() pkg.Artifact {
 	)
 	return t.New("xz-"+version, 0, []pkg.Artifact{
 		t.Load(Make),
+		t.Load(Gawk),
+		t.Load(Coreutils),
+		t.Load(Diffutils),
 	}, nil, nil, `
 cd "$(mktemp -d)"
 /usr/src/xz/configure \