Deprecation warnings

[durka]

When compiling clap from git master, I get a bunch of warnings from within clap:

   Compiling clap v2.27.1 (file:///home/haptics/proton/nri/overrides/clap)
   Compiling nri v0.1.0 (file:///home/haptics/proton/nri)
warning: use of deprecated item: No longer required to propagate values
   --> overrides/clap/src/macros.rs:745:19
    |
745 |                   $($n::$v => self.0.insert($c)),+
    |                     ^^^^^^
    |
   ::: overrides/clap/src/app/settings.rs
    |
69  | /     impl_settings! { AppSettings,
70  | |         ArgRequiredElseHelp => A_REQUIRED_ELSE_HELP,
71  | |         ArgsNegateSubcommands => ARGS_NEGATE_SCS,
72  | |         AllowExternalSubcommands => ALLOW_UNK_SC,
...   |
109 | |         ContainsLast => CONTAINS_LAST
110 | |     }
    | |_____- in this macro invocation
    |
    = note: #[warn(deprecated)] on by default

The rest are included here.