Only look for Development.Module python component

[maxnoe]

Looking for Development includes interpreter embedding, which requires the libpython.

This creates issues for building wheels in manylinux containers that intentionally do not ship libpython.

For building extension modules, only Development.Module is needed.

[maxnoe]

With this patch, I could use cibuildwheel to create manylinux gfal wheels:

• https://github.com/maxnoe/gfal2-python-cibuildwheel/
• https://github.com/maxnoe/gfal2-python-cibuildwheel/actions/runs/19167154299

which can be pip installed without any compilation step.

This would dramatically improve quality of life of gfal2-python users outside of conda.

[maxnoe]

While the wheels compiled, they do not find their plugins and config libraries. Any idea how we could solve these issues would be greatly appreciated.