[librsvg: 1/2] rsvg_internals: remove unused extern crate declaration

[Jordan Petridis <jpetridis src gnome org>]

commit 8ad9f50ba8bff3d8b3e74758878c1931b6273719
Author: Jordan Petridis <jpetridis gnome org>
Date:   Sat Dec 22 01:27:46 2018 +0200

    rsvg_internals: remove unused extern crate declaration
    
    also add a lint to warn about unused things

 Cargo.lock                | 1 -
 rsvg_internals/Cargo.toml | 1 -
 rsvg_internals/src/lib.rs | 2 +-
 3 files changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/Cargo.lock b/Cargo.lock
index 6534415c..8dcf781b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -972,7 +972,6 @@ dependencies = [
  "pango 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pango-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pangocairo 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "pangocairo-sys 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "phf 0.7.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "phf_codegen 0.7.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/rsvg_internals/Cargo.toml b/rsvg_internals/Cargo.toml
index 090fcade..bf89d050 100644
--- a/rsvg_internals/Cargo.toml
+++ b/rsvg_internals/Cargo.toml
@@ -43,7 +43,6 @@ owning_ref = "0.4.0"
 pango = "0.5.0"
 pango-sys = "0.7.0"
 pangocairo = "0.6.0"
-pangocairo-sys = "0.8.0"
 phf = "0.7.21"
 rayon = "1"
 regex = "1"
diff --git a/rsvg_internals/src/lib.rs b/rsvg_internals/src/lib.rs
index f1d97764..7fb70e79 100644
--- a/rsvg_internals/src/lib.rs
+++ b/rsvg_internals/src/lib.rs
@@ -1,6 +1,7 @@
 #![cfg_attr(feature = "cargo-clippy", allow(clone_on_ref_ptr))]
 #![cfg_attr(feature = "cargo-clippy", allow(not_unsafe_ptr_arg_deref))]
 #![cfg_attr(feature = "cargo-clippy", allow(too_many_arguments))]
+#![warn(unused)]
 
 extern crate cairo;
 extern crate cairo_sys;
@@ -22,7 +23,6 @@ extern crate nalgebra;
 extern crate num_traits;
 extern crate owning_ref;
 extern crate pango;
-extern crate pango_cairo_sys;
 extern crate pango_sys;
 extern crate pangocairo;
 extern crate rayon;