Makefile.mingw corrections and made the code pass much stricter checks (now mandated by Makefile.mignw) to ensure GCC 14 readiness.

src/codegen_new/codegen_backend_x86-64.c

@@ -290,7 +290,7 @@ static void build_loadstore_routines(codeblock_t *block)
         build_store_routine(block, 8, 1);
 }
 
-void codegen_backend_init()
+void codegen_backend_init(void)
 {
         codeblock_t *block;
         int c;