MDEV-9128 - Compiling on IBM System Z fails

Provided IBM System Z have outdated compiler version, which supports gcc sync
builtins but not gcc atomic builtins. It also has weak memory model.

InnoDB attempted to verify if __sync_lock_test_and_set() is available by
checking IB_STRONG_MEMORY_MODEL. This macro has nothing to do with availability
of __sync_lock_test_and_set(), the right one is HAVE_ATOMIC_BUILTINS.

storage/innobase/include/os0sync.h

@@ -487,7 +487,7 @@ os_atomic_clear(volatile lock_word_t* ptr)
 	__atomic_clear(ptr, __ATOMIC_RELEASE);
 }
 
-# elif defined(IB_STRONG_MEMORY_MODEL)
+# elif defined(HAVE_ATOMIC_BUILTINS)
 
 /** Do an atomic test and set.
 @param[in,out]	ptr		Memory location to set to non-zero