Migrate from winapi to windows-sys (#4346)

* Migrate from `winapi` to `windows-sys`

I believe that Microsoft itself is supporting the development of
`windows-sys` and it's also used by `cap-std` now so this switches
Wasmtime's dependencies on Windows APIs from the `winapi` crate to the
`windows-sys` crate. We still have `winapi` in our dependency graph but
that may get phased out over time.

* Make windows-sys a target-specific dependency

tests/all/memory.rs

@@ -266,8 +266,7 @@ unsafe fn assert_faults(ptr: *mut u8) {
     }
     #[cfg(windows)]
     {
-        use winapi::um::memoryapi::*;
-        use winapi::um::winnt::*;
+        use windows_sys::Win32::System::Memory::*;
 
         let mut info = std::mem::MaybeUninit::uninit();
         let r = VirtualQuery(