Remove direct dependency on libc

It's not actually used anymore anywhere.

Cargo.toml

@@ -23,7 +23,6 @@ unicode-segmentation  = "1.0.1"
 strsim    = { version = "0.6.0",  optional = true }
 ansi_term = { version = "0.9.0",  optional = true }
 term_size = { version = "0.2.2",  optional = true }
-libc      = { version = "0.2.20",  optional = true }
 yaml-rust = { version = "0.3.5",  optional = true }
 clippy    = { version = "~0.0.112", optional = true }
 atty      = { version = "0.2.2",  optional = true }
@@ -36,7 +35,7 @@ lazy_static = "0.2"
 default     = ["suggestions", "color", "wrap_help"]
 suggestions = ["strsim"]
 color       = ["ansi_term", "atty"]
-wrap_help   = ["libc", "term_size"]
+wrap_help   = ["term_size"]
 yaml        = ["yaml-rust"]
 unstable    = [] # for building with unstable clap features (doesn't require nightly Rust) (currently none)
 nightly     = [] # for building with unstable Rust features (currently none)

README.md

@@ -539,8 +539,8 @@ Then run `cargo build` or `cargo update && cargo build` for your project.
 #### Features enabled by default
 
 * **"suggestions"**: Turns on the `Did you mean '--myoption'?` feature for when users make typos. (builds dependency `strsim`)
-* **"color"**: Turns on colored error messages. This feature only works on non-Windows OSs. (builds dependency `ansi-term` and `libc`)
-* **"wrap_help"**: Wraps the help at the actual terminal width when available, instead of 120 chracters. (builds dependency `term_size`, and `libc`)
+* **"color"**: Turns on colored error messages. This feature only works on non-Windows OSs. (builds dependency `ansi-term`)
+* **"wrap_help"**: Wraps the help at the actual terminal width when available, instead of 120 chracters. (builds dependency `term_size`)
 
 To disable these, add this to your `Cargo.toml`:
 

src/lib.rs

@@ -329,7 +329,7 @@
 //! 
 //! * **"suggestions"**: Turns on the `Did you mean '--myoption'?` feature for when users make typos. (builds dependency `strsim`)
 //! * **"color"**: Turns on colored error messages. This feature only works on non-Windows OSs. (builds dependency `ansi-term` and `atty`)
-//! * **"wrap_help"**: Wraps the help at the actual terminal width when available, instead of 120 chracters. (builds dependency `term_size`, and `libc`)
+//! * **"wrap_help"**: Wraps the help at the actual terminal width when available, instead of 120 chracters. (builds dependency `term_size`)
 //! 
 //! To disable these, add this to your `Cargo.toml`:
 //! 
@@ -534,8 +534,6 @@ extern crate strsim;
 extern crate ansi_term;
 #[cfg(feature = "yaml")]
 extern crate yaml_rust;
-#[cfg(feature = "wrap_help")]
-extern crate libc;
 extern crate unicode_width;
 #[macro_use]
 extern crate bitflags;