RTEMS | testsuites/libtests/dl06: Base image has lcong48 (!1574)

[Sebastian Huber (@sebhub)]

Sebastian Huber created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1574

Project:Branches: sebhub/rtems:up/dl06-lcong48 to rtems/rtos/rtems:main
Author: Sebastian Huber

## Summary

Closes #5802.

**Problem:** The module of `dl06` calls `lcong48()`. With a Newlib built with `--enable-newlib-reent-thread-local`, the object file of `lcong48()` defines the thread-local rand48 state. A loaded module cannot provide thread-local objects, because the base image link fixes the TLS size of each thread. The load stops with "global symbol not found: _tls_rand48_add".

**Fix:**

- Link `lcong48()` into the base image with `-Wl,--undefined=lcong48`, so that the module resolves it there.
- Keep the expected failure of `dl06`. Its reason now names the remaining defects, #5801 and rtems/tools/rtems-tools#43 to rtems/tools/rtems-tools#45.

**Review hints:**

- The flag also holds under `--gc-sections` and needs no change of the test code.

## Test

Built with an `rtems-ld` which carries fixes for rtems/tools/rtems-tools#43 to rtems/tools/rtems-tools#45, on `aarch64/a53_lp64_qemu`, `arm/xilinx_zynq_a9_qemu`, `i386/pc586-sse`, `microblaze/petalogix_s3adsp1800`, `mips/jmr3904`, `mips/malta`, `powerpc/psim`, `riscv/rv64imafdc`, `sparc/gr712rc`, `sparc/gr740` and `sparc/gr765`:

| Build | `dl06` |
| --- | --- |
| this MR | the load fails at the relocation types of the RAP file, see #5801 |
| this MR and a loader fix for #5801 | `END OF TEST` on all 11 BSPs |

## AI Details
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The implementation was produced in that session under my direction, and the commit message was drafted there.

### Access

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-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1574
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