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Since C code can use it and it’s simple, we might as well use C.
* lisp/subr.el (proper-list-p): Move to C code.
* src/eval.c (signal_error): Simplify by using Fproper_list_p.
* src/fns.c (Fproper_list_p): New function, moved here from Lisp.

Simplify signal_error
* src/eval.c (signal_error): Simplify by using FOR_EACH_TAIL_SAFE.