[!TARGET_API_MAC_CARBON] Include charset.h, coding.h, and Endian.h.

[!TARGET_API_MAC_CARBON] Include charset.h, coding.h, and Endian.h.
[!MAC_OSX] (fchmod, fchown): New functions.
(mac_get_code_from_arg): Don't accept Lisp integer as argument.
Use SBYTES and EndianU32_BtoN.
(mac_get_object_from_code): Return 4 byte string even if argument
is 0.  Use make_unibyte_string and EndianU32_NtoB.
(Fmac_get_file_creator, Fmac_get_file_type, Fmac_set_file_creator)
(Fmac_set_file_type): Fix documents and argument declarations.
Don't specify kFSCatInfoNodeFlags.  Support Mac OS Classic.