view::linear_distribute should be marked single pass

[dvirtz]

The following code fails on an assertion and should fail to compile:

auto ld = view::linear_distribute(1, 10, 10);
auto i = next(ld.begin(), 4);
distance(ld.begin(), i);

output is

prog.exe: /opt/wandbox/range-v3/include/range/v3/view/linear_distribute.hpp:55: 
bool ranges::v3::view::linear_distribute_view<int>::equal(const linear_distribute_view<T> &) const [T = int]: 
Assertion `from_ == other.from_ && to_ == other.to_' failed.

https://wandbox.org/permlink/71k8ETkWzTkWrIW4