[librsvg] Add pango-sys to the Rust dependencies

[Federico Mena Quintero <federico src gnome org>]

commit 922fac5c28a5591148014c97d3a668a04f5ce47a
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Dec 14 09:24:37 2017 -0600

    Add pango-sys to the Rust dependencies

 rust/Cargo.lock | 1 +
 rust/Cargo.toml | 1 +
 rust/src/lib.rs | 2 ++
 3 files changed, 4 insertions(+)
---
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 7462252..ce22eea 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -421,6 +421,7 @@ dependencies = [
  "lalrpop-util 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "pango 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pango-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index a0a8020..b608983 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -12,6 +12,7 @@ lalrpop-util = "0.13.1"
 cssparser = "^0.18.2"
 itertools = "0.7.4"
 pango = "0.3.0"
+pango-sys = "0.5.0"
 
 [dependencies.cairo-sys-rs]
 version = "0.5.0"
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index 94f5234..ffc2a2f 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -5,6 +5,8 @@ extern crate glib;
 extern crate glib_sys;
 extern crate libc;
 extern crate itertools;
+extern crate pango;
+extern crate pango_sys;
 
 #[macro_use]
 extern crate downcast_rs;