lib/mingle: [nfc] change C includes to their C++ equivalents

diff --git a/lib/mingle/ink.cpp b/lib/mingle/ink.cpp
index 2c7caa43d7c6648ba869640754d77afa12c99817..515275434c04942e7a46d36d3a5b00205a892a67 100644 (file)
--- a/lib/mingle/ink.cpp
+++ b/lib/mingle/ink.cpp
@@ -8,8 +8,8 @@
  * Contributors: Details at https://graphviz.org
  *************************************************************************/
 
-#include <math.h>
-#include <stdlib.h>
+#include <cmath>
+#include <cstdlib>
 #include <common/types.h>
 #include <common/globals.h>
 #include <sparse/general.h>