[bug-libunistring] u32_conv_from_encoding doesn't always respect lconveh_escape_sequence

[Rob Browning]

This call appears to end up taking the "indirectly" "?" path in
mem_cd_iconveh_internal, even though it asks for
iconveh_escape_sequence:

  size_t u32len = 0;
  const char *str = "\xb5"; // ISO-8859-1 Greek Mu
  wchar_t *u32 = u32_conv_from_encoding ("utf8", iconveh_escape_sequence,
                                         str, strlen(str), NULL, NULL, &u32len);

Also seen via:

  guile -c '(write (program-arguments)) (newline)' $'\xb5'

in a UTF-8 locale, which (eventually) makes a similar call.

Thanks
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
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