Trivial +server variants considered harmful

[Joshua Root]

There seem to be some ports (e.g. ntop, mysql5) with a +server variant
that does nothing but create a startupitem. It seems to me that it would
be much better to remove the variant and just always create the
startupitem, since the cost of creating a startupitem is negligible,
while the cost of having to recompile the port if you forget to specify
+server is considerable.

- Josh