Auto merge of #3520 - devnexen:fuchsia_upd, r=JohnTitor

fuchsia adding pthread_set/getname_np

Author: bors

libc-test/semver/fuchsia.txt

@@ -1377,8 +1377,10 @@ pthread_cancel
 pthread_condattr_getclock
 pthread_condattr_setclock
 pthread_getattr_np
+pthread_getname_np
 pthread_kill
 pthread_mutex_timedlock
+pthread_setname_np
 ptsname_r
 pwritev
 quotactl

src/fuchsia/mod.rs

@@ -3826,6 +3826,8 @@ extern "C" {
     pub fn pthread_rwlock_unlock(lock: *mut pthread_rwlock_t) -> ::c_int;
     pub fn pthread_rwlockattr_init(attr: *mut pthread_rwlockattr_t) -> ::c_int;
     pub fn pthread_rwlockattr_destroy(attr: *mut pthread_rwlockattr_t) -> ::c_int;
+    pub fn pthread_getname_np(thread: ::pthread_t, name: *mut ::c_char, len: ::size_t) -> ::c_int;
+    pub fn pthread_setname_np(thread: ::pthread_t, name: *const ::c_char) -> ::c_int;
     pub fn strerror_r(errnum: ::c_int, buf: *mut c_char, buflen: ::size_t) -> ::c_int;
 
     pub fn getsockopt(