Fix for C23.

--- mftrace-1.2.14/gf2pbm.c	2006-10-21 13:15:25.000000000 +0100
+++ mftrace-1.2.14/gf2pbm.c	2025-07-07 12:03:23.744815889 +0100
@@ -106,7 +106,6 @@
 #endif
 #endif
 
-typedef enum {false,true}bool;
 bool debug;
 
 struct font {