collect all Fuchsia bindings into the `fuchsia` module

The Fuchsia bindings are currently spread out across multiple modules in `sys/pal/unix` leading to unnecessary duplication. This PR moves all of these definitions into `sys::pal::unix::fuchsia` and additionally:
* deduplicates the definitions
* makes the error names consistent
* marks some extern functions as safe
* removes unused items (there's no need to maintain these bindings if we're not going to use them)
* removes the documentation for the definitions (contributors should always consult the platform documentation, duplicating that here is just an extra maintenance burden)

1 files changed, 3 insertions, 3 deletions

diff --git a/library/std/src/sys/sync/mutex/fuchsia.rs b/library/std/src/sys/sync/mutex/fuchsia.rs
index 3d388a4564a..cbb1926530f 100644
--- a/library/std/src/sys/sync/mutex/fuchsia.rs
+++ b/library/std/src/sys/sync/mutex/fuchsia.rs
@@ -39,7 +39,7 @@
 
 use crate::sync::atomic::Ordering::{Acquire, Relaxed, Release};
 use crate::sync::atomic::{Atomic, AtomicU32};
-use crate::sys::futex::zircon::{
+use crate::sys::fuchsia::{
     ZX_ERR_BAD_HANDLE, ZX_ERR_BAD_STATE, ZX_ERR_INVALID_ARGS, ZX_ERR_TIMED_OUT, ZX_ERR_WRONG_TYPE,
     ZX_OK, ZX_TIME_INFINITE, zx_futex_wait, zx_futex_wake_single_owner, zx_handle_t,
     zx_thread_self,
@@ -83,13 +83,13 @@ impl Mutex {
 
     #[inline]
     pub fn try_lock(&self) -> bool {
-        let thread_self = unsafe { zx_thread_self() };
+        let thread_self = zx_thread_self();
         self.futex.compare_exchange(UNLOCKED, to_state(thread_self), Acquire, Relaxed).is_ok()
     }
 
     #[inline]
     pub fn lock(&self) {
-        let thread_self = unsafe { zx_thread_self() };
+        let thread_self = zx_thread_self();
         if let Err(state) =
             self.futex.compare_exchange(UNLOCKED, to_state(thread_self), Acquire, Relaxed)
         {