no-std fixes

afl/src/metamap.rs

@@ -1,5 +1,7 @@
 use hashbrown::HashMap;
 use hashbrown::hash_map::{ValuesMut, Values};
+use alloc::boxed::Box;
+use alloc::vec::Vec;
 use core::slice::{Iter, IterMut};
 use core::any::{TypeId, Any};
 

afl/src/serde_anymap.rs

@@ -1,6 +1,7 @@
 use hashbrown::HashMap;
 use serde::{Serialize, Deserialize};
 
+use alloc::boxed::Box;
 use core::default::Default;
 use core::any::{TypeId, Any};
 use core::fmt;