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

src/codegen/codegen_accumulate_x86.c

@@ -58,7 +58,7 @@ void codegen_accumulate_flush(void)
 	acc_regs[0].count = 0;
 }
 
-void codegen_accumulate_reset()
+void codegen_accumulate_reset(void)
 {
 	acc_regs[0].count = 0;
 }