remove cfg gate on use RawVec since it is now also used in fallible code

Author: the8472

library/alloc/src/boxed.rs

@@ -157,7 +157,6 @@ use crate::alloc::{handle_alloc_error, WriteCloneIntoRaw};
 use crate::alloc::{AllocError, Allocator, Global, Layout};
 #[cfg(not(no_global_oom_handling))]
 use crate::borrow::Cow;
-#[cfg(not(no_global_oom_handling))]
 use crate::raw_vec::RawVec;
 #[cfg(not(no_global_oom_handling))]
 use crate::str::from_boxed_utf8_unchecked;