[bug-recutils] Bad recfix output for invalid enum values in Non-US-ASCII fields

[Mampir]

Hi!

Here is an example:
  # -*- mode: rec -*-

  %rec: Text
  %type: Cyrillic enum BUG

  Cyrillic: БЪГ

  # End of report.rec

When an "enum" field type is set, and a corresponding field's value
contains Non-US-ASCII characters, recfix outputs the following error:
  report.rec:6: error:

Instead, recfix should output the following:
  report.rec:6: error: invalid enum value.