Use the provided configure script

Our method of option-passing to vim could best be described as "vestigial."
We go to great lengths to avoid running the configure script, and then pass
everything as weird options directly to make(1).

Instead, just use the provided configure script like a normal person.
Combined with OPTIONS helpers, this makes the Makefile much, much simpler.
No PORTREVISION bump because there shouldn't be any changes to the resulting
package (except for Lua), and I'm updating vim tomorrow anyway.

Every language binding was enabled as built-in rather than dynamic, except
for Lua. Lua is now built-in binding like all the others. If there was some
reason that it was supposed to be dynamic, I'm happy to put it back.