Compiler warning on missing prototypes (Mac)

[iritkatriel]

./Modules/readline.c:1018:16: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
on_startup_hook()
^
void
./Modules/readline.c:1033:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
on_pre_input_hook()
^
void
2 warnings generated.

Linked PRs

• gh-105240: add missing function prototypes #105241