[librsvg] Remove unused macro_use

[Federico Mena Quintero <federico src gnome org>]

commit cd0bea5e4483b2ef800198b1bf1a7f3d1871e3ce
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Sep 18 17:17:13 2018 -0500

    Remove unused macro_use

 rsvg_internals/src/lib.rs | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/rsvg_internals/src/lib.rs b/rsvg_internals/src/lib.rs
index c9ff411a..c7da7c78 100644
--- a/rsvg_internals/src/lib.rs
+++ b/rsvg_internals/src/lib.rs
@@ -23,7 +23,6 @@ extern crate regex;
 #[macro_use]
 extern crate lazy_static;
 
-#[macro_use]
 extern crate downcast_rs;
 
 pub use color::{rsvg_css_parse_color, ColorKind, ColorSpec};