net-misc/sks: re-add -j1 as build fails without
drwxr-xr-x - app-crypt
drwxr-xr-x - dev-libs
drwxr-xr-x - dev-perl
drwxr-xr-x - metadata
drwxr-xr-x - net-misc
drwxr-xr-x - profiles