Fix dyn Trait in noop modules

Author: alexcrichton

src/backtrace/noop.rs

@@ -4,7 +4,7 @@
 use core::ffi::c_void;
 
 #[inline(always)]
-pub fn trace(_cb: &mut FnMut(&super::Frame) -> bool) {}
+pub fn trace(_cb: &mut dyn FnMut(&super::Frame) -> bool) {}
 
 #[derive(Clone)]
 pub struct Frame;

src/symbolize/noop.rs

@@ -7,7 +7,7 @@ use crate::SymbolName;
 use core::ffi::c_void;
 use core::marker;
 
-pub unsafe fn resolve(_addr: ResolveWhat, _cb: &mut FnMut(&super::Symbol)) {}
+pub unsafe fn resolve(_addr: ResolveWhat, _cb: &mut dyn FnMut(&super::Symbol)) {}
 
 pub struct Symbol<'a> {
     _marker: marker::PhantomData<&'a i32>,