Fix build with C23 compiler

[dinuxbg]

Fix GCC build when using -std=gnu23 option.

[Wren6991]

I hit the same issue. Can confirm this fix works. An alternative is to just use stdbool

diff --git a/src/wikisort/libwikisort.c b/src/wikisort/libwikisort.c
index 4bdc701..3810f88 100644
--- a/src/wikisort/libwikisort.c
+++ b/src/wikisort/libwikisort.c
@@ -28,13 +28,7 @@
 #include <string.h>
 #include <math.h>
 #include <limits.h>
-
-/* various #defines for the C code */
-#ifndef true
-#define true 1
-#define false 0
-typedef uint8_t bool;
-#endif
+#include <stdbool.h>
 
 #define Var(name, value, type) type name = value

Without one of these patches, this benchmark fails to compile by default on GCC 15 (where C23 is the default version now).