UNICODE/UTF-8 on win32

We know it's broken and won't be fixed for 8.0.

If we just #ifndef WIN32 the definitions in utils/mb/encnames.c it won't
be possible to select that encoding, right? Will that have any other
unwanted effects (such as breaking client encodings)? If not, I suggest
this is done.

(Or perhaps something can be done in pg_valid_server_encoding?)

//Magnus


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