[ots] Don't fail if cmap subtables are not ordered
[ots] Don't fail if cmap subtables are not ordered

We rewrite the cmap table anyway so the result will always be incorrect
order. Left the warning message in case someone finds it useful.

Closes #42

khaledhosny/ots,irori/ots,irori/ots,anthrotype/ots,davelab6/ots,anthrotype/ots,davelab6/ots