partially HirIdify lints

Auto merge of rust-lang#3662 - mikerite:fix-498, r=oli-obk

Fix `map_clone` bad suggestion

`cloned` requires that the elements of the iterator must be references. This
change determines if that is the case by examining the type of the closure
argument and suggesting `.cloned` only if it is a reference. When the closure
argument is not a reference, it suggests removing the `map` call instead.

A minor problem with this change is that the new check sometimes overlaps
with the `clone_on_copy` lint.

Fixes rust-lang#498

Merge pull request rust-lang#3459 from flip1995/sugg_appl

Add Applicability to suggestion lints: Take 2

Enable rustup clippy to refer to the correct documentation

Enable rustup clippy to refer to the correct documentation

Merge pull request rust-lang#3194 from flip1995/c_void

Fix c_void path

Merge pull request rust-lang#3194 from flip1995/c_void

Fix c_void path

Version checks are useless now that we ride the trains

Version checks are useless now that we ride the trains

Version checks are useless now that we ride the trains