Windows: remove binary UTF-8 (#225)

If less was using UTF-8 mode, but the console was not, characters that
could not be displayed were considered binary.  This is undesirable in
Windows Terminal, and not really all that helpful anyway, so simply
remove the test.  Resolves #221.

charset.c

@@ -805,18 +805,6 @@ is_ubin_char(ch)
 {
  int ubin = is_in_table(ch, &ubin_table) ||
  (bs_mode == BS_CONTROL && is_in_table(ch, &fmt_table));
-#if MSDOS_COMPILER==WIN32C
- if (!ubin && utf_mode == 2 && ch < 0x10000)
- {
- /*
- * Consider it binary if it can't be converted.
- */
- BOOL used_default = TRUE;
- WideCharToMultiByte(GetConsoleOutputCP(), WC_NO_BEST_FIT_CHARS, (LPCWSTR) &ch, 1, NULL, 0, NULL, &used_default);
- if (used_default)
- ubin = 1;
- }
-#endif
  return ubin;
 }