Delete "nonconstructable" enums are "noncopyable" test

tests/ui/non-copyable-void.rs

@@ -1,10 +0,0 @@
-use std::ffi::c_void;
-
-fn main() {
-    let x : *const Vec<isize> = &vec![1,2,3];
-    let y : *const c_void = x as *const c_void;
-    unsafe {
-        let _z = (*y).clone();
-        //~^ ERROR no method named `clone` found
-    }
-}

tests/ui/non-copyable-void.stderr

@@ -1,9 +0,0 @@
-error[E0599]: no method named `clone` found for enum `c_void` in the current scope
-  --> $DIR/non-copyable-void.rs:7:23
-   |
-LL |         let _z = (*y).clone();
-   |                       ^^^^^ method not found in `c_void`
-
-error: aborting due to 1 previous error
-
-For more information about this error, try `rustc --explain E0599`.