Fix build with gcc 15
https://bugs.gentoo.org/944172
https://github.com/devkitPro/wiiload/pull/4

--- a/source/main.c
+++ b/source/main.c
@@ -28,6 +28,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <libgen.h>
+#include <stdbool.h>
 #ifndef _WIN32
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -62,8 +63,6 @@ typedef signed short s16;
 typedef signed int s32;
 typedef signed long long s64;
 
-typedef enum { false, true } bool;
-
 #ifndef __WIN32__
 static const char *desc_export = "export";
 #ifndef __APPLE__