internal/rosa: fix up dependencies

These are no longer provided by the (incomplete) toybox implementations, so they need to be specified explicitly.

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

internal/rosa/wayland.go

@@ -13,6 +13,8 @@ func (t Toolchain) newWayland() pkg.Artifact {
 		t.Load(PkgConfig),
 		t.Load(CMake),
 		t.Load(Ninja),
+		t.Load(Gawk),
+		t.Load(Diffutils),
 
 		t.Load(Libffi),
 		t.Load(Libexpat),