rust: elide lifetimes for clippy analysis

A new version of Rust has made unnecessary lifetime annotations an
error for `cargo clippy`. This change removes them, replacing them with
a default `'_`.

rust/ittapi/src/event.rs

@@ -72,7 +72,7 @@ impl StartedEvent<'_> {
     }
 }
 
-impl<'a> Drop for StartedEvent<'a> {
+impl Drop for StartedEvent<'_> {
     fn drop(&mut self) {
         if let Some(end_fn) = unsafe { ittapi_sys::__itt_event_end_ptr__3_0 } {
             let result = unsafe { end_fn(self.event) };

rust/ittapi/src/region.rs

@@ -57,7 +57,7 @@ impl Region {
 /// A [`MarkedRegion`] is a Rust helper structure for ergonomically ending a marked region using
 /// `__itt_mark_pt_region_end`. See [`Region::mark`] for more details.
 pub struct MarkedRegion<'a>(&'a Region);
-impl<'a> MarkedRegion<'a> {
+impl MarkedRegion<'_> {
     /// End the marked region.
     #[inline]
     pub fn end(self) {

rust/ittapi/src/task.rs

@@ -43,7 +43,7 @@ impl<'a> Task<'a> {
     }
 }
 
-impl<'a> Drop for Task<'a> {
+impl Drop for Task<'_> {
     fn drop(&mut self) {
         // If `ittnotify` has not been initialized, this function may not be wired up.
         if let Some(end_fn) = unsafe { ittapi_sys::__itt_task_end_ptr__3_0 } {