Re: Emacs 28.1 doesn't compile on Mac OS 10.7.5

[Werner LEMBERG <wl@gnu.org>]

> It seems likely that this version has __clang_major__ = 4 despite
> begin based on 3.2; if so, then the attached change may be the right
> solution.  Would you give it a try?

This helps, thanks.  However, it is not sufficient.  Here's the next
compilation error (omitting the follow-up ones).

```
sysdep.c:4133:3: error: use of undeclared identifier 'rusage_info_current'
  rusage_info_current ri;
  ^
sysdep.c:4134:7: warning: implicit declaration of function
                 'proc_pid_rusage' is invalid in C99
                 [-Wimplicit-function-declaration]
  if (proc_pid_rusage(proc_id, RUSAGE_INFO_CURRENT, (rusage_info_t *) &ri) == 0)
      ^
  ...
```


    Werner