* vectors.c, vectors.h (scm_make_vector): Removed third argument.

* vectors.c, vectors.h (scm_make_vector): Removed third argument.
This change makes scm_make_vector R5RS compatible.  We cannot keep
the third argument since people want to be able to deduce the form
of the C function call only by looking at R5RS.  (At the same time
we have removed some unnecessary complexity!)

* eval.c, filesys.c, fluids.c, gc.c, gh_data.c, init.c, kw.c,
net_db.c, posix.c, print.c, regex-posix.c, scmsigs.c, socket.c,
stime.c, symbols.c, unif.c, vectors.c, weaks.c: Removed third
argument in call to scm_make_vector.