Fix bare_trait_objects deprecation

src/codec/context.rs

@@ -11,13 +11,13 @@ use {Codec, Error};
 
 pub struct Context {
     ptr: *mut AVCodecContext,
-    owner: Option<Rc<Drop>>,
+    owner: Option<Rc<dyn Drop>>,
 }
 
 unsafe impl Send for Context {}
 
 impl Context {
-    pub unsafe fn wrap(ptr: *mut AVCodecContext, owner: Option<Rc<Drop>>) -> Self {
+    pub unsafe fn wrap(ptr: *mut AVCodecContext, owner: Option<Rc<dyn Drop>>) -> Self {
         Context {
             ptr: ptr,
             owner: owner,

src/codec/parameters.rs

@@ -6,13 +6,13 @@ use media;
 
 pub struct Parameters {
     ptr: *mut AVCodecParameters,
-    owner: Option<Rc<Drop>>,
+    owner: Option<Rc<dyn Drop>>,
 }
 
 unsafe impl Send for Parameters {}
 
 impl Parameters {
-    pub unsafe fn wrap(ptr: *mut AVCodecParameters, owner: Option<Rc<Drop>>) -> Self {
+    pub unsafe fn wrap(ptr: *mut AVCodecParameters, owner: Option<Rc<dyn Drop>>) -> Self {
         Parameters {
             ptr: ptr,
             owner: owner,

src/util/format/pixel.rs

@@ -937,7 +937,7 @@ impl error::Error for ParsePixelError {
         }
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
             ParsePixelError::NulError(ref e) => Some(e),
             ParsePixelError::UnknownFormat => None,