[issue13916] disallow the "surrogatepass" handler for non utf-* encodings

[STINNER Victor]

STINNER Victor added the comment:

It makes sense to restrict surrogatepass to UTF-* encodings. UTF-8, UTF-16 and UTF-32 encoders reject surrogate characters, but not UTF-7. Is it a bug? I'm asking because PyCodec_SurrogatePassErrors() doesn't support UTF-7.

IMO your change is important enough to be mentionned in What's new Python 3.5 document, and maybe also in the documentation of the codecs module.

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