[librsvg] cargo-clippy: marker.rs: Copy some enums, don't move them

[Federico Mena Quintero <federico src gnome org>]

commit e5cb58191e229f40fb4d97c99147a26e2c66e6ee
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Feb 22 13:38:00 2018 -0600

    cargo-clippy: marker.rs: Copy some enums, don't move them

 rust/src/marker.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/rust/src/marker.rs b/rust/src/marker.rs
index 528b3410..88d3ea0a 100644
--- a/rust/src/marker.rs
+++ b/rust/src/marker.rs
@@ -567,7 +567,7 @@ fn bisect_angles (incoming: f64, outgoing: f64) -> f64 {
 }
 
 // From SVG's marker-start, marker-mid, marker-end properties
-#[derive(Debug, PartialEq)]
+#[derive(Debug, Copy, Clone, PartialEq)]
 enum MarkerType {
     Start,
     Middle,
@@ -608,6 +608,7 @@ fn get_marker_name_from_drawing_ctx (draw_ctx:    *const RsvgDrawingCtx,
     }
 }
 
+#[derive(Debug, Copy, Clone, PartialEq)]
 enum MarkerEndpoint {
     Start,
     End