lib/pack: replace header guards with more modern #pragma once

diff --git a/lib/pack/pack.h b/lib/pack/pack.h
index 6b2a5c3aa1b34a386ed9af7f6d3991ecd15b53e1..6668c4bb1312301d846f5099d557c6e3b67e36e3 100644 (file)
--- a/lib/pack/pack.h
+++ b/lib/pack/pack.h
@@ -8,10 +8,7 @@
  * Contributors: Details at https://graphviz.org
  *************************************************************************/
 
-
-
-#ifndef _PACK_H
-#define _PACK_H 1
+#pragma once
 
 #ifdef __cplusplus
 extern "C" {
@@ -91,4 +88,3 @@ typedef unsigned int packval_t;
 #ifdef __cplusplus
 }
 #endif
-#endif