Use new linking support

[jonnor]

No description provided.

[jonnor]

Tested working on ESP32-S3 with MicroPython 1.24.1, so that seems good.
However on Gitlab CI the modules fail to build on armv6m, with unsupported relocation.

On building emlearn_trees

   File "/home/runner/work/emlearn-micropython/emlearn-micropython/micropython/tools/mpy_ld.py", line 707, in do_relocation_text
    assert 0, r_info_type
AssertionError: 2

This does not happen locally for me, with arm-none-eabi 14.1.0 on Arch Linux. Whereas CI has arm-none-eabi 13.2.1 on Ubuntu 24.04. So it might be version specific?

[jonnor]

armv6m can be fixed later, as it is also broken in master (crashing).