LibBSD | waf: Add uninstall command (!139)

[Matteo Concas (@matteo.concas)]

Matteo Concas commented on a discussion: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/139#note_149859


> How exactly is this command used?

After the configure step you would do `./waf uninstall` and it would reverse a potential `./waf install`, removing the installed files.

> I notice there's not a corresponding uninstall function added to the bottom of the wscript file and I thought that was required for top-level commands to function.

I don't see a install function at the bottom of the wscript either so I assume these are handled by Waf directly? I'm not super familiar with the system.

> I don't know that we can guarantee a full reversion of the installation action. I remember something about default files from the BSP being overwritten in rare but intentional cases which would prevent this.

That may be the case. I know the main RTEMS repo and rtems-lwip have the ability to use this uninstall command so I figured rtems-libbsd should have it too.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/139#note_149859
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