synch: Remove implicit unsafe impls

src/synch/recmutex.rs

@@ -86,7 +86,3 @@ impl RecursiveMutex {
 		}
 	}
 }
-
-// Same unsafe impls as `RecursiveMutex`
-unsafe impl Sync for RecursiveMutex {}
-unsafe impl Send for RecursiveMutex {}

src/synch/semaphore.rs

@@ -42,10 +42,6 @@ pub struct Semaphore {
 	state: SpinlockIrqSave<SemaphoreState>,
 }
 
-// Same unsafe impls as `Semaphore`
-unsafe impl Sync for Semaphore {}
-unsafe impl Send for Semaphore {}
-
 impl Semaphore {
 	/// Creates a new semaphore with the initial count specified.
 	///