RTEMS | Add -Wold-style-declaration warning to defaults and fix old style declaration (!698)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/698

Project:Branches: joel/rtems:fix-old-style-declaration-warnings to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill



## Summary
    
Newer C versions require that the storage-class specifier like static or _Thread_Local be the first thing in a declaration. Adding this warning to the default set to let us eliminate violations.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/698
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