[librsvg] Remove unused import.

[Federico Mena Quintero <federico src gnome org>]

commit 3a5f8a3c50799468794a0076dac0d699eff21841
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Feb 17 09:56:06 2017 -0600

    Remove unused import.

 rust/src/node.rs |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/rust/src/node.rs b/rust/src/node.rs
index df03e4c..e20d1e0 100644
--- a/rust/src/node.rs
+++ b/rust/src/node.rs
@@ -4,7 +4,6 @@ use std::rc::Rc;
 use std::rc::Weak;
 use std::cell::RefCell;
 use std::ptr;
-use std::mem;
 
 use drawing_ctx::RsvgDrawingCtx;