Fix for libstdc++-v3's error_constants.h for MinGW-W64

[Jonathan Wakely]

On 16/12/16 16:28 +0300, niXman wrote:
>Jonathan Wakely 2016-12-16 16:04:
>
>>I don't think this is suitable for the branches, but could be applied
>>to trunk (as the patch was posted during stage 1, but I missed it).
>Ok.
>
>>Does this require a particular version of MinGW-w64?
>Yes, at the moment MinGW-W64 trunk is required. (MinGW-W64-v6)
>
>>Does it work for older versions?
>No.

OK, how about this instead then?

This unconditionally enables all the error codes supported by
mingw-w64 v5, and uses configure checks to detect the ones that are
only available on trunk. This means it will still work for v5, but if
you use trunk you get them all.

Could you test this please?


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