gh-121199: Use _Py__has_attribute() in timemodule.c (#121203)

Use the _Py__has_attribute() macro in timemodule.c and
bootstrap_hash.c to fix a build error on old GCC versions (GCC 4.8.5
on s390x).

Author: vstinner

Modules/timemodule.c

@@ -1488,7 +1488,7 @@ _PyTime_GetThreadTimeWithInfo(PyTime_t *tp, _Py_clock_info_t *info)
       !defined(__EMSCRIPTEN__) && !defined(__wasi__)
 #define HAVE_THREAD_TIME
 
-#if defined(__APPLE__) && defined(__has_attribute) && __has_attribute(availability)
+#if defined(__APPLE__) && _Py__has_attribute(availability)
 static int
 _PyTime_GetThreadTimeWithInfo(PyTime_t *tp, _Py_clock_info_t *info)
      __attribute__((availability(macos, introduced=10.12)))

Python/bootstrap_hash.c

@@ -199,7 +199,7 @@ py_getrandom(void *buffer, Py_ssize_t size, int blocking, int raise)
 
    getentropy() is retried if it failed with EINTR: interrupted by a signal. */
 
-#if defined(__APPLE__) && defined(__has_attribute) && __has_attribute(availability)
+#if defined(__APPLE__) && _Py__has_attribute(availability)
 static int
 py_getentropy(char *buffer, Py_ssize_t size, int raise)
         __attribute__((availability(macos,introduced=10.12)))