Import macfont changes from mac-port 4.5.

Import macfont changes from mac-port 4.5.
* macfont.h (kCTVersionNumber10_9): Define if not defined.

* macfont.m (mac_font_copy_default_descriptors_for_language)
(mac_font_copy_default_name_for_charset_and_languages): Declare.
(cf_charset_table): big-5-0 has uniquifier 0x4EDC.
(macfont_language_default_font_names): New.
(macfont_list): Rearrange language/charset code.
(macfont_close): Don't check for macfont_info->cache.
(mac_ctfont_create_preferred_family_for_attributes): New font
selection code, call
mac_font_copy_default_name_for_charset_and_languages.
(mac_font_copy_default_descriptors_for_language)
(mac_font_copy_default_name_for_charset_and_languages): New functions.