SIS | sis.c: fix pedantic warnings (!15)

[Jiri Gaisler (@jirigaisler)]

Jiri Gaisler created a merge request: https://gitlab.rtems.org/rtems/tools/rtems-sis/-/merge_requests/15

Project:Branches: jirigaisler/rtems-sis:warnfix to rtems/tools/rtems-sis:main
Author: Jiri Gaisler

## Summary

sis.c: fix pedantic warnings

```
-Wincompatible-pointer-types
-Wold-style-definition

No functional change, only squelshing of warnings.
Also affects erc32.c exec.c func.c interf.c riscv.c sparc.c
```

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View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-sis/-/merge_requests/15
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