gh-110079: Remove extern "C" { ...} in C code (#110080)

Python/pylifecycle.c

@@ -61,11 +61,6 @@
 #define PUTS(fd, str) (void)_Py_write_noraise(fd, str, (int)strlen(str))
 
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
 /* Forward declarations */
 static PyStatus add_main_module(PyInterpreterState *interp);
 static PyStatus init_import_site(void);
@@ -3139,7 +3134,3 @@ PyOS_setsig(int sig, PyOS_sighandler_t handler)
     return oldhandler;
 #endif
 }
-
-#ifdef __cplusplus
-}
-#endif