fix unnecessary cast lint (#2596)

* fix clippy lints on Windows

* fix lints on other platforms

* a couple more

* again

* don't know what's goging on anymore

* fix examples

* comon

* how about now?

* this is getting annoying

* hmmm

* explicitly set a type

* 😢

* don't cast on x64 targets

* apply code review requests

* fix attributes on expressions

* fix ios

src/platform_impl/windows/drop_handler.rs

@@ -169,7 +169,7 @@ impl FileDropHandler {
         let drop_format = FORMATETC {
             cfFormat: CF_HDROP as u16,
             ptd: ptr::null_mut(),
-            dwAspect: DVASPECT_CONTENT as u32,
+            dwAspect: DVASPECT_CONTENT,
             lindex: -1,
             tymed: TYMED_HGLOBAL as u32,
         };