Next had a few issues with its packaging:
* the platform port was exposed in all-packages
  And this is not useful for outside users.
  It's now a local attribute in the next package.

* the platform port wasn't wrapped correctly
  It appears that the lisp core was being wrapped,
  when instead the actual gtk application that's
  called within the lisp core had to be wrapped.

* codestyle/indentation

riot-{web,desktop}: 1.5.0 -> 1.5.5

next: Fix #74258

These tests fail to pickle a file locally

Instead of one derivation providing a cmake-compatible library and one
providing a setuptools-compatible library, we now support both ways of
consuming the library for both pybind11 and python.pkgs.pybind11.