FIX: cherrypick some fixes from https://github.com/Proxmark/proxmark3/pull/550 (pwpiwi)

client/hardnested/hardnested_bruteforce.c

@@ -138,8 +138,13 @@ bool verify_key(uint32_t cuid, noncelist_t *nonces, uint8_t *best_first_bytes, u
 	}
 	return true;
 }
-
-static void* __attribute__((force_align_arg_pointer)) crack_states_thread(void* x){
+static void* 
+#ifdef __has_attribute
+	#if __has_attribute(force_align_arg_pointer)
+	__attribute__((force_align_arg_pointer)) 
+	#endif
+#endif
+crack_states_thread(void* x){
 	struct arg {
 		bool silent;
 		int thread_ID;