Missing pragma once. (#554)

mjp41 · web-flow · commit 8f8dbd83b5a9 · 2022-09-08T09:54:53.000+01:00
diff --git a/src/snmalloc/override/malloc-extensions.h b/src/snmalloc/override/malloc-extensions.h
@@ -1,3 +1,4 @@
+#pragma once
 /**
  * Malloc extensions
  *
