You can uninstall or removes an installed libfolks-dummy-dev package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove libfolks-dummy-dev
If you would like to remove libfolks-dummy-dev and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libfolks-dummy-dev
If you use with purge options to libfolks-dummy-dev package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libfolks-dummy-dev
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove libfolks-dummy-dev