This will now properly wrap the gns3 binary using wrapQtApp instead of
unnecessarily adding qt5Full to the PATH (which significantly increases
the closure and often causes the build to break due to broken transitive
dependencies).
This supersedes the old approach from commit 0eaec4dee2.
qt5Full may not be installed on users' systems and the gns3-gui depends
on it explicitly.
Note: This also fixes e.g. "nix-shell -p gns3-gui --pure" (at the cost
of an increased closure size).
gns3Packages.{server,gui}Preview: 2.2.0rc5 -> 2.2.0
The new dependency on setuptools is required for pkg_resources:
ImportError: No module named pkg_resources
