register-ccl-program
register-ccl-program is a built-in function in `C source code
'.
(register-ccl-program NAME CCL-PROG)
Register CCL program CCL-PROG as NAME in `ccl-program-table'.
CCL-PROG should be a compiled CCL program (vector), or nil.
If it is nil, just reserve NAME as a CCL program name.
Return index number of the registered CCL program.