bug#36717: 25.3; greek.el: deprecated vowel+oxia combinations should be replaced with vowel+tonos counterparts

[Robert Pluim]

>>>>> On Thu, 18 Jul 2019 19:16:39 +0100, "Basil L. Contovounesios" 
>>>>> <contovob@tcd.ie> said:

    Basil> diff --git a/lisp/leim/quail/rfc1345.el b/lisp/leim/quail/rfc1345.el

Note that rfc1345.el has entries for both vowel + oxia and vowel +
tonos variants, so we should probably not change it.