Vanilla build warning clean-up

Vanilla build warning clean-up

	* lisp/emacs-lisp/disass.el (native-comp-unit-file)
	(subr-native-comp-unit): Declare function.
	* lisp/progmodes/elisp-mode.el (native-compile): Likewise.
	* lisp/emacs-lisp/package.el (comp-el-to-eln-filename): Likewise.
	* lisp/startup.el (normal-top-level): Silence warning.
	* src/data.c (syms_of_data): 'Ssubr_native_lambda_list' is always
	defined.
	* src/pdumper.c (dump_cold_native_subr): Move under ifdefs.
	(dump_drain_cold_data): Add ifdefs.