RTEMS | Update zlib to eliminate warnings with GCC 15 (#5263)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5263



## Summary

Newer GCC versions have turned K&R old-style function definitions into at least warnings. The zlib version in RTEMS has almost 100 warnings of this type. Hopefully it can be updated to eliminate these. Here is an example of one.

```
In file included from ../../../cpukit/include/zlib.h:34,
                 from ../../../cpukit/compression/zlib/zutil.h:22,
                 from ../../../cpukit/compression/zlib/zutil.c:8:
../../../cpukit/compression/zlib/zutil.c: In function 'z_zError':
../../../cpukit/include/zconf.h:139:33: warning: old-style function definition [-Wold-style-definition]
  139 | #  define zError                z_zError
      |                                 ^~~~~~~~
../../../cpukit/compression/zlib/zutil.c:135:22: note: in expansion of macro 'zError'
  135 | const char * ZEXPORT zError(err)
```

## Steps to reproduce

Compile with GCC 15.

### Pre-set options

-- 
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