(encode_coding_iso2022): New local variable safe_chars. Check
unsafe chars.
(setup_coding_system): Delete the code to initialize
- coding->safe_charses.
+ coding->safe_charsets.
(intersection, find_safe_codings): New functions.
(Ffind_coding_systems_region_internal): New function.
(syms_of_coding): Defsubr it. Initialize Qsafe_chars,