You can uninstall or removes an installed libghc-hsyslog-dev-1.6-732ef package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove libghc-hsyslog-dev-1.6-732ef
If you would like to remove libghc-hsyslog-dev-1.6-732ef and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libghc-hsyslog-dev-1.6-732ef
If you use with purge options to libghc-hsyslog-dev-1.6-732ef package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libghc-hsyslog-dev-1.6-732ef
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 libghc-hsyslog-dev-1.6-732ef