RTEMS Source Builder | Qemu build relies on libslirp.so (backport to 6) (#214)

[Joel Sherrill (@joel)]

Issue created by Joel Sherrill: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/work_items/214

Assignee: Joel Sherrill

## Summary

Backport of #210 with changes in !301

Qemu built by the RSB relies on _libslirp.so_. Unfortunately, the one we build is not used by default so on Rocky 9, it results in a failure:

```
$ ~/rtems-work/tools/next/qemu/bin/qemu-system-arm
/home/joel/rtems-work/tools/next/qemu/bin/qemu-system-arm: /lib64/libslirp.so.0: version `SLIRP_4.9' not found (required by /home/joel/rtems-work/tools/next/qemu/bin/qemu-system-arm)
/home/joel/rtems-work/tools/next/qemu/bin/qemu-system-arm: /lib64/libslirp.so.0: version `SLIRP_4.7' not found (required by /home/joel/rtems-work/tools/next/qemu/bin/qemu-system-arm)
/home/joel/rtems-work/tools/next/qemu/bin/qemu-system-arm: /lib64/libslirp.so.0: version `SLIRP_4.5' not found (required by /home/joel/rtems-work/tools/next/qemu/bin/qemu-system-arm)
```

This can be resolved by setting _LD_LIBRARY_PATH_ to point to the _libslirp.so_ installed by the RSB. The following command or just exporting LD_LIBRARY_PATH works.

`LD_LIBRARY_PATH=/home/joel/rtems-work/tools/next/qemu/lib64  /tmp/rttools/bin/rtems-test --rtems-bsp=malta_qemu `find build -name hello.exe``

Depending on the host operating systems this is happening on, it could be negatively impacting the cron sweeper.

## Steps to reproduce

This is a normal RSB build of qemu. I think all you need is to be on a host without the _libslirp.so_ version used to build qemu.



## Steps to reproduce


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View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/work_items/214
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