Implement Drop::pin_drop for !Unpin types

[frank-king]

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[rust-log-analyzer]

The job pr-check-1 failed! Check out the build log: (web) (plain enhanced) (plain)

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[RUSTC-TIMING] gimli test:false 5.698
    Checking addr2line v0.25.0
[RUSTC-TIMING] addr2line test:false 0.556
[RUSTC-TIMING] object test:false 9.544
error: could not impl `Drop::drop(&mut self)` for a type that implements `!Unpin`
   --> library/std/src/sys/pal/unix/sync/condvar.rs:163:5
    |
163 |     fn drop(&mut self) {
    |     ^^^^^^^^^^^^^^^^^^ help: consider implement `Drop::pin_drop(&pin mut self)` instead
    |
    = help: `impl !Unpin` is intended for pinned projections, which requires the value pinned until it's deallocated
note: `Unpin` implemented for `sys::pal::unix::sync::condvar::Condvar`
   --> library/std/src/sys/pal/unix/sync/condvar.rs:156:1
    |
156 | impl !Unpin for Condvar {}
    | ^^^^^^^^^^^^^^^^^^^^^^^

error: could not impl `Drop::drop(&mut self)` for a type that implements `!Unpin`
   --> library/std/src/sys/pal/unix/sync/mutex.rs:107:5
    |
107 |     fn drop(&mut self) {
    |     ^^^^^^^^^^^^^^^^^^ help: consider implement `Drop::pin_drop(&pin mut self)` instead
    |
    = help: `impl !Unpin` is intended for pinned projections, which requires the value pinned until it's deallocated
note: `Unpin` implemented for `sys::pal::unix::sync::mutex::Mutex`
   --> library/std/src/sys/pal/unix/sync/mutex.rs:101:1
    |
101 | impl !Unpin for Mutex {}
    | ^^^^^^^^^^^^^^^^^^^^^

[RUSTC-TIMING] std test:false 6.860
error: could not compile `std` (lib) due to 2 previous errors
Build completed unsuccessfully in 0:03:31

[bors]

☔ The latest upstream changes (presumably #146071) made this pull request unmergeable. Please resolve the merge conflicts.