microxrcedds_agent.so fails to link in cross environment

Ninguém assumiu esta issue ainda.

**Describe the bug**
I tried using a cross compile workflow for Micro ROS Agent and it has linker errors.

**To Reproduce**
Steps to reproduce the behaviour:
1. Clone repo on this branch and follow the dockerized instructions: https://github.com/Ryanf55/x-ros/tree/micro-ros-agent
2. Compile the micro ros agent as explained
3. Observe the following error:

```
# [ 2%] Linking CXX shared library libmicroxrcedds_agent.so
# /usr/lib/gcc-cross/aarch64-linux-gnu/11/../../../../aarch64-linux-gnu/bin/ld: /opt/ros/humble/lib/libfastrtps.so.2.6.8: error adding symbols: file in wrong format
```

The linker is incorrectly trying to link to /opt/ros/humble/lib/libfastrtps.so.2.6.8. It should be linking to the shared library in the sysroot, not the host.

**Expected behaviour**
Successful compilation in a sysroot and linkage only to libraries in the sysroot.

**System information (please complete the following information):**
- OS: Host OS Ubuntu 22
- ROS 2 humble on host OS
- Target OS: Ubuntu 22

**Additional context**

I have ROS 2 humble installed on the host OS. MicroROS should compile in the sysroot and ignore all host libraries.
Because it does not ignore host libraries, it is finding libraries of the wrong architecture.

Comece pelas instruções de compilação cruzada em Docker e pelo comando de build que produz libmicroxrcedds_agent.so. Investigue por que /opt/ros/humble/lib/libfastrtps.so.2.6.8 aparece nas entradas do linker em vez da biblioteca do sysroot e, em seguida, reproduza o build para a arquitetura de destino informada. A tarefa estará concluída quando o agente for linkado com sucesso usando apenas bibliotecas do sysroot.

Escrita pelo modelo de indexação a partir do texto da issue.