freecad: small cleanup

* FreeCAD v0.14 switched from pyqt4 to pyside, remove unneeded pyqt4 dependency
* cmake.patch is not used anymore, remove it
* License is now only LGPLv2+ (since v0.14)
* Homepage moved to http://www.freecadweb.org/

Ref. http://www.freecadweb.org/wiki/index.php?title=Release_notes_014