Rename to inhibit-automatic-native-compilation

Rename to inhibit-automatic-native-compilation

* src/comp.c (maybe_defer_native_compilation):
(syms_of_comp):
* lisp/subr.el (native-comp-deferred-compilation):
* lisp/startup.el (inhibit-native-compilation):
(normal-top-level):
* lisp/progmodes/elisp-mode.el (emacs-lisp-native-compile-and-load):
* lisp/emacs-lisp/comp.el (comp-trampoline-compile):
* etc/NEWS:
* doc/lispref/compile.texi (Native-Compilation Variables): Rename
inhibit-native-compilation to inhibit-automatic-native-compilation.