[patch] ENUM errdetail should mention bytes, not chars

Hi

The errdetail emitted when creating/modifying an ENUM value is misleading:

postgres=# CREATE TYPE enum_valtest AS ENUM (
'foo',
'ああああああああああああああああああああああ'
);
ERROR: invalid enum label "ああああああああああああああああああああああ"
DETAIL: Labels must be 63 characters or less.

Attached trivial patch changes the message to:

DETAIL: Labels must be 63 bytes or less.

This matches the documentation, which states:

The length of an enum value's textual label is limited by the NAMEDATALEN
setting compiled into PostgreSQL; in standard builds this means at most
63 bytes.

https://www.postgresql.org/docs/current/datatype-enum.html

I don't see any particular need to backpatch this.

Regards

Ian Barwick

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