RTEMS | Check to see if long_gcc.py is still needed. (#5138)

[Amar Takhar (@amar)]

Amar Takhar created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5138



## Summary

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Per ita on Discord `long_gcc.py` is no longer needed as it's handled internally in waf.  If waf doesn't support something and we require it then it would be considered a bug:

* https://discord.com/channels/820452222382112799/820789584392749156/1300201435618869288
* https://discord.com/channels/820452222382112799/820789584392749156/1300203299034890403

## Steps to reproduce

### Pre-set options

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5138
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