entries.
(po-find-charset): Doc fix. Remove interactive spec.
(po): Provide.
(po-find-file-coding-system-guts): Re-written to use
coding-system-alist, and code-pages, not codepage stuff.
car of each association to a string.
(po-find-file-coding-system-guts): If the charset matches a name
of a codepage, set up that codepage and return it as a coding
system to decode the file.
