Chicken eggs do not always contain version information, yet dependant packages
often rely on this information being present. Thus, add a version field if it
is missing.
* guix/build/chicken-build-system.scm (stamp-egg-version): New variable.
(%standard-phases): Add ‘stamp-egg-version’.
Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>