RTEMS | pc386 fails to build (bsps/i386/shared/irq/irq.c) (#5740)

[Joel Sherrill (@joel)]

Issue created by Joel Sherrill: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5740

Assignee: Sebastian Huber

## Summary

Running rtems-bsp-builder, it appears that every configuration and variant of the pc386 family fails with errors like these. Full log is [here](https://lists.rtems.org/pipermail/build/2026-September/076585.html)

```
         i386/pc386:
      configure --prefix=/home/joel/rtems-work/tools/7/bsps\
      --top=/home/joel/rtems-work/rtems --rtems-\
      config=config-i386-pc386-debug.ini
      bsps/i386/shared/irq/irq.c:145:13: error: conflicting types for\
      'lapic_initialize'; have 'void(void)'
      bsps/i386/shared/irq/irq.c:400:5: error: 'LAPIC_ICR' undeclared\
      (first use in this function); did you mean 'LAPIC_IRR'?
          i386/pc386:
      configure --prefix=/home/joel/rtems-work/tools/7/bsps\
      --top=/home/joel/rtems-work/rtems --rtems-\
      config=config-i386-pc386-no-posix.ini
      bsps/i386/shared/irq/irq.c:145:13: error: conflicting types for\
      'lapic_initialize'; have 'void(void)'
      bsps/i386/shared/irq/irq.c:400:5: error: 'LAPIC_ICR' undeclared\
      (first use in this function); did you mean 'LAPIC_IRR'?
          i386/pc386:
      configure --prefix=/home/joel/rtems-work/tools/7/bsps\
      --top=/home/joel/rtems-work/rtems --rtems-\
      config=config-i386-pc386-posix.ini
      bsps/i386/shared/irq/irq.c:145:13: error: conflicting types for\
      'lapic_initialize'; have 'void(void)'
      bsps/i386/shared/irq/irq.c:400:5: error: 'LAPIC_ICR' undeclared\
      (first use in this function); did you mean 'LAPIC_IRR'?
          i386/pc386:

```

## Steps to reproduce

Build a pc386 BSP

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