seafile-client source: version-substvar-for-external-package * ${source:Upstream-Version} seafile-gui -> libseafile0
seafile-client source: version-substvar-for-external-package * ${source:Upstream-Version} seafile-gui -> seafile-daemon
seafile-client source: version-substvar-for-external-package * ${source:Upstream-Version} seafile-gui -> seafile-cli
