RTEMS | Resolve remaining sign compare and function cast warnings (!1052)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1052

Project:Branches: opticron/rtems:brmain-fix-more-warnings to rtems/rtos/rtems:main
Author:   Kinsey Moore
Assignee: Kinsey Moore


## Summary

cpukit/dev/can: Resolve sign comparison warning

Make the constant unsigned so that signedness on both sides of the
comparison matches.

spec/jffs2: Remove sign comparison checks on third party code

cpukit/or1k: Update CPU_ISR_handler signature

Update the OR1K CPU_ISR_handler function signature to avoid casting
function pointers.

x86_64/amd64: Address SMP sign compare warning

spec/optwarn: Drop global warning avoidance flags

Now that all warnings should be resolved, drop the flags disabling the
remaining warnings.

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