Support pthread_{set,get}name_np for linux with glibc

Author: condy0919

src/unix/linux_like/linux/gnu/mod.rs

@@ -1024,6 +1024,11 @@ extern {
                       buf: *mut ::c_char,
                       buflen: ::size_t,
                       result: *mut *mut ::group) -> ::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;
 }
 
 cfg_if! {