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_allocator.h

@@ -22,7 +22,7 @@
 #define MEM_BLOCK_MASK (MEM_BLOCK_NR-1)
 #define MEM_BLOCK_SIZE 0x3c0
 
-void codegen_allocator_init();
+void codegen_allocator_init(void);
 /*Allocate a mem_block_t, and the associated backing memory.
   If parent is non-NULL, then the new block will be added to the list in
   parent->next*/