[librsvg] Angle::from_degrees(): Use f64::to_radians()

[Federico Mena Quintero <federico src gnome org>]

commit 9eba059b8d1d206c1a23c258b128850aa20f1b13
Author: Federico Mena Quintero <federico gnome org>
Date:   Mon Dec 10 11:32:13 2018 -0600

    Angle::from_degrees(): Use f64::to_radians()
    
    The libcore implementation does
    
            let value: f64 = consts::PI;
            self * (value / 180.0)
    
    I wonder if parenthesizing the second term is more numerically stable
    or something.

 rsvg_internals/src/marker.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/rsvg_internals/src/marker.rs b/rsvg_internals/src/marker.rs
index 149eda85..88faa874 100644
--- a/rsvg_internals/src/marker.rs
+++ b/rsvg_internals/src/marker.rs
@@ -597,7 +597,7 @@ impl Angle {
     }
 
     pub fn from_degrees(deg: f64) -> Angle {
-        Angle(Angle::normalize(deg * PI / 180.0))
+        Angle(Angle::normalize(deg.to_radians()))
     }
 
     pub fn from_vector(vx: f64, vy: f64) -> Angle {