RTEMS Source Builder | defaults.mc: Drop c and c++ versions to 11 and 17 (!267)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/merge_requests/267

Project:Branches: opticron/rtems-source-builder:br5-c-versions to rtems/tools/rtems-source-builder:5
Author:   Kinsey Moore
Assignee: Kinsey Moore


## Summary

defaults.mc: Drop c and c++ versions to 11 and 17

Closes #190


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