(Only the first 10 of 159 ports in this commit are shown above. )
Make all GNUstep ports install into the System domain so that the Local domain
is available for stuff built from source.
Some ports were already installing in the System domain, for these just remove
the Makefile lines explicitly specifying the install domain.
The rest are installed in the Local domain, remove any overrides, update their
pkg-plists and any explicit paths in the Makefiles and then bump port revision.
Approved by: bapt (mentor)
Differential Revision: https://reviews.freebsd.org/D2977