Missing pragma once

Zephiles · Zephiles · commit cfe3453e8205 · 2018-05-23T05:34:54.000-05:00
Somehow forgot to put that in.
diff --git a/ttyd-tools/rel/include/buttons.h b/ttyd-tools/rel/include/buttons.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <cstdio>
 
 // Enumerations
