mlang: Change EnumRfc1766_create return values to error codes

[Gregor Schneider]

Currently EnumRfc1766_create returns status values, which will not be
accepted as failed by the FAILED macro which can lead to unexpected
behaviour.
Therefore those values should be changed to error values. See
http://bugs.winehq.org/show_bug.cgi?id=20991 for more info.

Best regards,
Gregor Schneider
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