RTEMS | Resolve various warnings (!1047)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1047

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


## Summary

shared/irq: Resolve function cast warning

The function cast from more parameters to fewer parameters is generally
unsafe as the additional parameters will be undefined values that happen
to be in the right registers if it is ever called. Instead of casting
the function pointer, provide a dummy function pointer when the original
function pointer is non-NULL since it is only ever used for a
NULL-check.

spec/jffs2: Update warning flags for summary support

This flag was missed due to out of date GCC and is necessary for GCC 15
to avoid errors in third-party code.

libmisc/stringto: Resolve error on 64bit systems

On 32bit systems, int and long are the same size. This is not the case
on 64bit systems. This corrects the maximum value of the stringto type
on those systems.

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