Auto merge of #2752 - ian-h-chamberlain:horizon/pthread_condattr, r=Amanieu

Add pthread_condattr_{set,get}clock on Horizon OS

These are supported by this `pthread-3ds` PR: rust3ds/pthread-3ds#16 and are required to compile, notably, `parking_lot_core` for the `armv6k-nintendo-3ds` target.

cc: `@Meziu` `@AzureMarker`

Author: bors

src/unix/newlib/horizon/mod.rs

@@ -250,6 +250,16 @@ extern "C" {
         param: *const ::sched_param,
     ) -> ::c_int;
 
+    pub fn pthread_condattr_getclock(
+        attr: *const ::pthread_condattr_t,
+        clock_id: *mut ::clockid_t,
+    ) -> ::c_int;
+
+    pub fn pthread_condattr_setclock(
+        attr: *mut ::pthread_condattr_t,
+        clock_id: ::clockid_t,
+    ) -> ::c_int;
+
     pub fn pthread_getprocessorid_np() -> ::c_int;
 
     pub fn getrandom(buf: *mut ::c_void, buflen: ::size_t, flags: ::c_uint) -> ::ssize_t;