Rollup merge of #105049 - mkroening:hermit-fixes, r=jyn514

Hermit: Minor build fixes

These changes are necessary to build for the hermit targets.

CC: ``@stlankes``

Author: matthiaskrgr

Diff for: library/std/src/sys/hermit/fs.rs

@@ -1,10 +1,8 @@
-use crate::convert::TryFrom;
-use crate::ffi::{CStr, CString, OsString};
+use crate::ffi::{CStr, OsString};
 use crate::fmt;
 use crate::hash::{Hash, Hasher};
 use crate::io::{self, Error, ErrorKind};
 use crate::io::{BorrowedCursor, IoSlice, IoSliceMut, SeekFrom};
-use crate::os::unix::ffi::OsStrExt;
 use crate::path::{Path, PathBuf};
 use crate::sys::common::small_c_string::run_path_with_cstr;
 use crate::sys::cvt;

Diff for: library/std/src/sys/hermit/thread.rs

@@ -5,6 +5,7 @@ use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
 use crate::num::NonZeroUsize;
+use crate::ptr;
 use crate::sys::hermit::abi;
 use crate::sys::hermit::thread_local_dtor::run_dtors;
 use crate::time::Duration;
@@ -47,7 +48,7 @@ impl Thread {
         extern "C" fn thread_start(main: usize) {
             unsafe {
                 // Finally, let's run some code.
-                Box::from_raw(main as *mut Box<dyn FnOnce()>)();
+                Box::from_raw(ptr::from_exposed_addr::<Box<dyn FnOnce()>>(main).cast_mut())();
 
                 // run all destructors
                 run_dtors();