libstdc++: Revert making ref_view<R> statically sized.

This patch reverts all changes except introduction of
ranges::__static_size from r17-810-g7239744d25dadf.

In addition to expected errors from breaking inplace_vector
preconditions, this lead to change in the return type of
define_static_array, when applied on (adapted) ref_view:
  int x[10];
  auto x = define_static_array(x | views::transform(...));
Type of x changed from span<const ...> to span<const ..., 10>,
due size being statically know.

This was considered beyond the scope of implementation freedom,
and we should wait for acceptance of P3928R0 instead.

libstdc++-v3/ChangeLog:

	* include/std/ranges (ref_view::size()): Only call ranges::size(*_M_r).
	(ref_view::empty): Only call ranges::empty(*_M_r).
	* testsuite/23_containers/inplace_vector/cons/from_iota_neg.cc:
	Except no errors from ref_view uses.
	* testsuite/23_containers/inplace_vector/cons/from_range_neg.cc:
	Likewise.