RTEMS | libmisc/shell: Add -a to print all vars in the shell getenv command (!1241)

[Chris Johns (@chris)]

Chris Johns created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1241

Project:Branches: chris/rtems:chris/5572-getenv-all to rtems/rtos/rtems:main
Author:   Chris Johns
Assignee: Chris Johns


## Summary

Add -a to print all vars in the shell getenv command

Closes #5572

## Generative AI

No

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1241
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