Add redis_ prefix for member2struct, avoid redefined warning in FreeBSD (#11549)
It look like it will generate a warning in FreeBSD:
```
./server.h:105:9: warning: 'member2struct' macro redefined [-Wmacro-redefined]
#define member2struct(struct_name, member_name, member_addr) \
^
/usr/include/sys/param.h:365:9: note: previous definition is here
#define member2struct(s, m, x) \
^
```
Add a `redis_` prefix to it, avoid the warning, introduced in #11511
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