Guard GCC13 pragma

Author: tannewt

py/stackctrl.c

@@ -31,7 +31,10 @@ void mp_stack_ctrl_init(void) {
     // Force routine to not be inlined. Better guarantee than MP_NOINLINE for -flto.
     __asm volatile ("");
     #pragma GCC diagnostic push
+    #if __GNUC__ > 12
+    // Introduced in GCC 13
     #pragma GCC diagnostic ignored "-Wdangling-pointer"
+    #endif
     volatile int stack_dummy;
     MP_STATE_THREAD(stack_top) = (char *)&stack_dummy;
     #pragma GCC diagnostic pop