Rollup merge of #105120 - solid-rs:patch/kmc-solid/maintainance, r=thomcc

kmc-solid: `std::sys` code maintenance

Includes a set of changes to fix the [`*-kmc-solid_*`](https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html) Tier 3 targets and make some other improvements.

- Address `fuzzy_provenance_casts` by using `expose_addr` and `from_exposed_addr` for pointer-integer casts
- Add a stub implementation of `is_terminal` (#98070)
- Address `unused_imports` and `unused_unsafe`
- Stop doing `Box::from_raw(&*(x: Box<T>) as *const T as *mut T)`

2 files changed, 5 insertions, 2 deletions

diff --git a/library/std/src/sys/solid/io.rs b/library/std/src/sys/solid/io.rs
index 9eb17a10daa..a862bb78702 100644
--- a/library/std/src/sys/solid/io.rs
+++ b/library/std/src/sys/solid/io.rs
@@ -75,3 +75,7 @@ impl<'a> IoSliceMut<'a> {
         unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
     }
 }
+
+pub fn is_terminal<T>(_: &T) -> bool {
+    false
+}
diff --git a/library/std/src/sys/solid/os.rs b/library/std/src/sys/solid/os.rs
index 4906c62689d..6135921f0b5 100644
--- a/library/std/src/sys/solid/os.rs
+++ b/library/std/src/sys/solid/os.rs
@@ -1,7 +1,6 @@
 use super::unsupported;
-use crate::convert::TryFrom;
 use crate::error::Error as StdError;
-use crate::ffi::{CStr, CString, OsStr, OsString};
+use crate::ffi::{CStr, OsStr, OsString};
 use crate::fmt;
 use crate::io;
 use crate::os::{