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(Finsert_file_contents): If coding-system-for-read is bound to
Qauto_save_coding, use the coding system emacs-mule with special
setting for recovering a file.
(choose_write_coding_system): On auto saving, use the coding
system emacs-mule with special setting for auto saving.
(syms_of_fileio) <Qauto_save_coding>: Intern and staticpro it.