internal/rosa: remove busybox patch

This allows different versions of busybox to be attempted, to find one that works on arm.

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

internal/rosa/rsync.go

@@ -9,6 +9,7 @@ func (t Toolchain) newRsync() pkg.Artifact {
 	)
 	return t.New("rsync-"+version, false, []pkg.Artifact{
 		t.Load(Make),
+		t.Load(Gawk),
 	}, nil, nil, `
 cd "$(mktemp -d)"
 /usr/src/rsync/configure --prefix=/system \