VarDateFromStr parses yyyy-mm-dd as yyyy-dd-mm in European locales

[John Fremlin]

Europeans write dates generally as dd-mm-yyyy. This makes sense. So does
yyyy-mm-dd. Native will parse dates written yyyy-mm-dd correctly. Wine for some
reasons assumes they are yyyy-dd-mm. This is not a date ordering used anywhere
as far as I know and contradicts the MS behaviour.

I've submitted http://bugs.winehq.org/show_bug.cgi?id=26902

I've included a patch which fixes the problem and adds a testcase. Is
there anything I can do to improve the chances that this fairly
unambiguous fix meets the next release? -- I have some secret and
cunning plans which are unfortunately predicated on this being fixed.