Rollup merge of #85029 - jethrogb:jb/sgx-movable-mutex, r=m-ou-se

SGX mutex is movable

r? ``@m-ou-se``

library/std/src/sys/sgx/mutex.rs

@@ -8,7 +8,7 @@ pub struct Mutex {
     inner: SpinMutex<WaitVariable<bool>>,
 }
 
-pub type MovableMutex = Box<Mutex>;
+pub type MovableMutex = Mutex;
 
 // Implementation according to “Operating Systems: Three Easy Pieces”, chapter 28
 impl Mutex {