Win32 下编译失败

```
$ make
  CC      aarch64-softmmu/hw/pci/pci6254.o
E:/CI-Cor-Ready/xemu/xemu-loongson/hw/pci/pci6254.c: In function 'pci6254_new':
E:/CI-Cor-Ready/xemu/xemu-loongson/hw/pci/pci6254.c:48:15: warning: implicit declaration of function 'mmap' [-Wimplicit-function-declaration]
   48 |  s->mapaddr = mmap(NULL,PCI6254_MEM_SIZE,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED,fd,0);
      |               ^~~~
E:/CI-Cor-Ready/xemu/xemu-loongson/hw/pci/pci6254.c:48:15: warning: nested extern declaration of 'mmap' [-Wnested-externs]
E:/CI-Cor-Ready/xemu/xemu-loongson/hw/pci/pci6254.c:48:42: error: 'PROT_READ' undeclared (first use in this function); did you mean 'OF_READ'?
   48 |  s->mapaddr = mmap(NULL,PCI6254_MEM_SIZE,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED,fd,0);
      |                                          ^~~~~~~~~
      |                                          OF_READ
E:/CI-Cor-Ready/xemu/xemu-loongson/hw/pci/pci6254.c:48:42: note: each undeclared identifier is reported only once for each function it appears in
E:/CI-Cor-Ready/xemu/xemu-loongson/hw/pci/pci6254.c:48:52: error: 'PROT_WRITE' undeclared (first use in this function); did you mean 'OF_WRITE'?
   48 |  s->mapaddr = mmap(NULL,PCI6254_MEM_SIZE,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED,fd,0);
      |                                                    ^~~~~~~~~~
      |                                                    OF_WRITE
E:/CI-Cor-Ready/xemu/xemu-loongson/hw/pci/pci6254.c:48:63: error: 'PROT_EXEC' undeclared (first use in this function)
   48 |  s->mapaddr = mmap(NULL,PCI6254_MEM_SIZE,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED,fd,0);
      |                                                               ^~~~~~~~~
E:/CI-Cor-Ready/xemu/xemu-loongson/hw/pci/pci6254.c:48:73: error: 'MAP_SHARED' undeclared (first use in this function); did you mean 'LR_SHARED'?
   48 |  s->mapaddr = mmap(NULL,PCI6254_MEM_SIZE,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED,fd,0);
      |                                                                         ^~~~~~~~~~
      |                                                                         LR_SHARED
make[1]: *** [/e/CI-Cor-Ready/xemu/xemu-loongson/rules.mak:69：hw/pci/pci6254.o] 错误 1
make: *** [Makefile:481：subdir-aarch64-softmmu] 错误 2

```

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