[vdr-osdteletext/f17] Apply Udo Richter's patch taking advantage of new VDR 1.7.25 features.

[Ville Skyttä]

Summary of changes:

  b0af092... Apply Udo Richter's patch taking advantage of new VDR 1.7.2 (*)

(*) This commit already existed in another branch; no separate mail sent