libraries/webkitgtk: Removed forced -j1.
libraries/webkitgtk: Removed forced -j1.

Not necessary with the newer make

Signed-off-by: Matteo Bernardini <638c89fd48409d8ef3e3a3c9b0a27af8629fef36@slackbuilds.org>

panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds