(archive-summarize): Set buffer unibyte before

(archive-summarize): Set buffer unibyte before
calling archive-XXX-summarize.
(archive-file-name-handler): New function to make the caller
behave as if the extracted file existed.
(archive-set-buffer-as-visiting-file): New function to simulate
file visiting.  Uses archive-file-name-handler to make dos-w32
systems preserve the coding-system of the extracted files.
(archive-extract): Bind coding-system-for-write to
file-name-coding-system, coding-system-for-read to 'no-conversion.
Call archive-set-buffer-as-visiting-file after a member file is
inserted in the current buffer.
(archive-extract-by-stdout): Don't bind coding-system-for-read and
inherit-process-coding-system.
(archive-*-write-file-member): Give an encoded file name to
external archive program.
(archive-rename-entry): Likewise.
(archive-mode-revert): Set buffer unibyte before calling
revert-buffer.
(archive-arc-rename-entry, archive-zip-chmod-entry): Set buffer
unibyte before handling binary archive data.
(archive-lzh-rename-entry, archive-lzh-ogm,
archive-zip-chmod-entry): Likewise.
(archive-lzh-summarize): Set local variable efnname to the decoded
file name.  If default-enable-multibyte-characters is non-nil, set
buffer multibyte before inserting summary lines.