tests: use ffi::va_list::VaList

Author: workingjubilee

Diff for: tests/codegen/cffi/c-variadic-copy.rs

@@ -3,7 +3,7 @@
 #![crate_type = "lib"]
 #![feature(c_variadic)]
 #![no_std]
-use core::ffi::VaList;
+use core::ffi::va_list::VaList;
 
 extern "C" {
     fn foreign_c_variadic_1(_: VaList, ...);

Diff for: tests/codegen/cffi/c-variadic-opt.rs

@@ -3,7 +3,7 @@
 #![crate_type = "lib"]
 #![feature(c_variadic)]
 #![no_std]
-use core::ffi::VaList;
+use core::ffi::va_list::VaList;
 
 extern "C" {
     fn vprintf(fmt: *const i8, ap: VaList) -> i32;

Diff for: tests/codegen/cffi/c-variadic.rs

@@ -5,7 +5,7 @@
 #![crate_type = "lib"]
 #![feature(c_variadic)]
 #![no_std]
-use core::ffi::VaList;
+use core::ffi::va_list::VaList;
 
 extern "C" {
     fn foreign_c_variadic_0(_: i32, ...);

Diff for: tests/run-make/c-link-to-rust-va-list-fn/checkrust.rs

@@ -1,7 +1,7 @@
 #![crate_type = "staticlib"]
 #![feature(c_variadic)]
 
-use std::ffi::VaList;
+use std::ffi::va_list::VaList;
 use std::ffi::{c_char, c_double, c_int, c_long, c_longlong};
 use std::ffi::{CStr, CString};
 

Diff for: tests/ui/abi/variadic-ffi.rs

@@ -1,7 +1,7 @@
 //@ run-pass
 #![feature(c_variadic)]
 
-use std::ffi::VaList;
+use std::ffi::va_list::VaList;
 
 #[link(name = "rust_test_helpers", kind = "static")]
 extern "C" {

Diff for: tests/ui/c-variadic/variadic-ffi-4.rs

@@ -2,7 +2,7 @@
 #![no_std]
 #![feature(c_variadic)]
 
-use core::ffi::{VaList, VaListImpl};
+use core::ffi::va_list::{VaList, VaListImpl};
 
 pub unsafe extern "C" fn no_escape0<'f>(_: usize, ap: ...) -> VaListImpl<'f> {
     ap