Removal of $UNIQUENAME

[Kimmo Paasiala]

It would have been nice to have some kind of announcement about the
removal of $UNIQUENAME. I for example was depending on it in my
make.conf with declarations like these:

vim_SET= CONSOLE
vim_UNSET= GTK2 RUBY TCL

I can of course rewrite those now using $OPTIONS_NAME (editors_vim
prefix instead of vim) after reading bsd.option.mk and figuring out
the way that works...

-Kimmo