Uses bools for enabling/disabling debug.
Switch from self-defined to system version.
https://bugs.gentoo.org/944302
--- a/bfr.h
+++ b/bfr.h
@@ -9,6 +9,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
+#include <stdbool.h>
 #ifdef BUFPLAY
 #include <sys/mman.h>
 #endif
@@ -17,14 +18,13 @@
 # include "config.h"
 #endif
 
-typedef enum {false, true} logical;
 typedef enum { IN, RO, BF, WO, RW } state;
 
 #ifndef DEBUG
 # define debug(args...)
 #else
 # define debug(args...)  if(dodebug==true) { fprintf(stderr, ## args); }
-logical dodebug;
+bool dodebug;
 #endif
 #define verbose(args...)  if(verbose >= 1) { fprintf(stderr, ## args); }
 #define vverbose(args...)  if(verbose >= 2) { fprintf(stderr, ## args); }