refactor(tvix/eval): remove VM argument from suspended native thunks

Because they do not use it, and it can not be passed with the coming
generator refactoring.

Change-Id: I0d96f2357a7ee79cd8a0f401583d4286230d4a6b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8146
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>

tvix/eval/src/builtins/impure.rs

@@ -6,13 +6,7 @@ use std::{
     time::{SystemTime, UNIX_EPOCH},
 };
 
-use crate::{
-    errors::ErrorKind,
-    io::FileType,
-    value::{NixAttrs, Thunk},
-    vm::VM,
-    Value,
-};
+use crate::{errors::ErrorKind, io::FileType, value::NixAttrs, vm::VM, Value};
 
 #[builtins]
 mod impure_builtins {