Name change through the code:

Name change through the code:
coding-category-internal => coding-category-emacs-mule,
XXX_coding_internal => XXX_coding_emacs_mule,
coding_type_internal => coding_type_emacs_mule,
coding_type_automatic => coding_type_undecided,
CODING_CATEGORY_MASK_INTERNAL => CODING_CATEGORY_MASK_EMACS_MULE,
CODING_CATEGORY_IDX_INTERNAL => CODING_CATEGORY_IDX_EMACS_MULE,
CODING_EOL_AUTOMATIC => CODING_EOL_UNDECIDED.