[librsvg] Remove unused imports

[Federico Mena Quintero <federico src gnome org>]

commit 0697d8f35b8fcd2561617c62aa8353047b5929d2
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Mar 3 14:11:50 2017 -0600

    Remove unused imports

 rust/src/marker.rs |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/rust/src/marker.rs b/rust/src/marker.rs
index e112a1e..c577829 100644
--- a/rust/src/marker.rs
+++ b/rust/src/marker.rs
@@ -1146,7 +1146,6 @@ mod directionality_tests {
 
 #[cfg(test)]
 mod marker_tests {
-    use std::f64::consts::*;
     use super::*;
     extern crate cairo;