(Vcomposition_function_table,

(Vcomposition_function_table,
Qcomposition_function_table): Delete variables.
(Qauto_composed, Vauto_composition_function,
Qauto_composition_function): New variables.
(run_composition_function): Don't call
compose-chars-after-function.
(update_compositions): Clear `auto-composed' text property.
(compose_chars_in_text): Delete this function.
(syms_of_composite): Staticpro Qauto_composed and
Qauto_composition_function.  Declare Vauto_composition_function as
a Lisp variable.