RTEMS | Eliminate Old Style Prototypes to Compile Cleanly with GCC 15 (#5275)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5275



## Summary

The following warnings of this type are present with sparc/leon3. This issue is to address all of the ones found.

```
testsuites/benchmarks/dhrystone/dhry_2.c:32:6: warning: old-style function definition [-Wold-style-definition]
testsuites/benchmarks/dhrystone/dhry_2.c:66:6: warning: old-style function definition [-Wold-style-definition]
testsuites/benchmarks/dhrystone/dhry_2.c:86:6: warning: old-style function definition [-Wold-style-definition]
testsuites/benchmarks/dhrystone/dhry_2.c:111:13: warning: old-style function definition [-Wold-style-definition]
testsuites/benchmarks/dhrystone/dhry_2.c:137:9: warning: old-style function definition [-Wold-style-definition]
testsuites/benchmarks/dhrystone/dhry_2.c:179:9: warning: old-style function definition [-Wold-style-definition]
testsuites/benchmarks/dhrystone/dhry_1.c:297:6: warning: old-style function definition [-Wold-style-definition]
testsuites/benchmarks/dhrystone/dhry_1.c:331:6: warning: old-style function definition [-Wold-style-definition]
testsuites/benchmarks/dhrystone/dhry_1.c:354:6: warning: old-style function definition [-Wold-style-definition]
testsuites/sptests/sp06/task2.c:44:12: warning: old-style function definition [-Wold-style-definition]
```

## Steps to reproduce
Build with GCC 15.

### Pre-set options

-- 
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