Remove pthread_set_name_np from NuttX

Removed `pthread_set_name_np` function from the NuttX bindings as it does not exist in the NuttX API,
this change aligns the code with the actual NuttX implementation

Signed-off-by: Huang Qi <[email protected]>

(backport <rust-lang#4251>)
(cherry picked from commit f4ab0b1)

Author: no1wudi

src/unix/nuttx/mod.rs

@@ -556,7 +556,6 @@ extern "C" {
     pub fn clock_gettime(clockid: clockid_t, tp: *mut timespec) -> i32;
     pub fn futimens(fd: i32, times: *const timespec) -> i32;
     pub fn pthread_condattr_setclock(attr: *mut pthread_condattr_t, clock_id: clockid_t) -> i32;
-    pub fn pthread_set_name_np(thread: pthread_t, name: *const c_char) -> i32;
     pub fn pthread_setname_np(thread: pthread_t, name: *const c_char) -> i32;
     pub fn pthread_getname_np(thread: pthread_t, name: *mut c_char, len: usize) -> i32;
     pub fn getrandom(buf: *mut c_void, buflen: usize, flags: u32) -> isize;