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

diff --git a/lib/xdot/xdot.h b/lib/xdot/xdot.h
index e3d32eff3d4c0f7ec967decc404a05c8c0e3e095..3a86d56f0b1b5795651ddd57410f59bafebe00ac 100644 (file)
--- a/lib/xdot/xdot.h
+++ b/lib/xdot/xdot.h
@@ -8,8 +8,8 @@
  * Contributors: Details at https://graphviz.org
  *************************************************************************/
 
-#ifndef XDOT_H
-#define XDOT_H
+#pragma once
+
 #include <stdio.h>
 
 #ifdef __cplusplus
@@ -182,4 +182,3 @@ XDOT_API void freeXDotColor (xdot_color*);
 #ifdef __cplusplus
 }
 #endif
-#endif