Merge branch 'vd/pthread-setspecific-g11-fix' into maint

One CI task based on Fedora image noticed a not-quite-kosher
consturct recently, which has been corrected.

* vd/pthread-setspecific-g11-fix:
  async_die_is_recursing: work around GCC v11.x issue on Fedora

run-command.c

@@ -1093,7 +1093,7 @@ static NORETURN void die_async(const char *err, va_list params)
 static int async_die_is_recursing(void)
 {
 	void *ret = pthread_getspecific(async_die_counter);
-	pthread_setspecific(async_die_counter, (void *)1);
+	pthread_setspecific(async_die_counter, &async_die_counter); /* set to any non-NULL valid pointer */
 	return ret != NULL;
 }