glib: make RefCounted trait unsafe

Author: Matteo Biggio

glib/src/subclass/shared.rs

@@ -4,7 +4,7 @@
 
 use crate::translate::*;
 
-pub trait RefCounted: Clone + Sized + 'static {
+pub unsafe trait RefCounted: Clone + Sized + 'static {
     /// The inner type
     type InnerType;
 
@@ -18,7 +18,7 @@ pub trait RefCounted: Clone + Sized + 'static {
     unsafe fn from_raw(this: *const Self::InnerType) -> Self;
 }
 
-impl<T> RefCounted for std::sync::Arc<T>
+unsafe impl<T> RefCounted for std::sync::Arc<T>
 where
     T: 'static,
 {
@@ -38,7 +38,7 @@ where
     }
 }
 
-impl<T> RefCounted for std::rc::Rc<T>
+unsafe impl<T> RefCounted for std::rc::Rc<T>
 where
     T: 'static,
 {