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

diff --git a/lib/twopigen/circle.h b/lib/twopigen/circle.h
index a90f6f61f16efc296cfc861f7542892a81295604..93f617c07592b57eb4d5c941204aec30a40f5702 100644 (file)
--- a/lib/twopigen/circle.h
+++ b/lib/twopigen/circle.h
@@ -8,8 +8,7 @@
  * Contributors: Details at https://graphviz.org
  *************************************************************************/
 
-#ifndef CIRCLE_H
-#define CIRCLE_H
+#pragma once
 
 #include "render.h"
 
@@ -44,4 +43,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-#endif