Bug 20888 – std.range.Cycle does not compose with `const`

``` import std.stdio; import std.range; struct Data { char[4096] internal; Cycle!(char[4096]) cycle; auto get () const { return this.cycle.save(); } } void main () { Data d; writeln(d.get().take(10)); } ``` Expectation: 10 characters get printed Reality: ``` /usr/local/opt/dmd/include/dlang/dmd/std/range/package.d(2231): Error: cannot implicitly convert expression input of type const(Cycle!(char[4096])) to Cycle!(char[4096]) foo.d(14): Error: template instance std.range.take!(const(Cycle!(char[4096]))) error instantiating ```

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