Ensure Python 2.4 compatibility and Linux-restricted support
Ensure Python 2.4 compatibility and Linux-restricted support

- Make build_entry compatible with Python 2.4
- Re-add missing warning/comment that was forgotten while refactoring
- Replace `all()` with a good ol' for-loop Python 2.4 compatibility
- Make a condition check more explicit (when `state` is `query`)
- Make sure this module can only be run with on a Linux distribution
- Add a note about Linux-only support in the documentation
- Set the version in which recursive support was added, 2.0

thaim/ansible,thaim/ansible