Add libc feature to enable crossterm's libc backend (#1014)

* Add libc feature flag to Cargo.toml

Such that reedline can use crossterm with the libc feature.

* add lock file

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Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>

Author: NiltonVolpato

Cargo.lock

@@ -50,6 +50,7 @@ idle_callback = []
 sqlite = ["rusqlite/bundled", "serde_json"]
 sqlite-dynlib = ["rusqlite", "serde_json"]
 system_clipboard = ["arboard"]
+libc = ["crossterm/libc"]
 
 [[example]]
 name = "cwd_aware_hinter"