Prefer __nodiscard to __wur for readability.

[[nodiscard]] is the C++17 and C23 spelling, and even if you're not familiar with that yet, "wur" doesn't mean anything to anyone who isn't a libc maintainer!

Change-Id: I9a63b1e438a347a56535b01d6d05532ee052bcea
diff --git a/libc/include/bits/getentropy.h b/libc/include/bits/getentropy.h
index b9be4d1..98d8879 100644
--- a/libc/include/bits/getentropy.h
+++ b/libc/include/bits/getentropy.h
@@ -48,6 +48,6 @@
  *
  * See also arc4random_buf() which is available in all API levels.
  */
-__wur int getentropy(void* _Nonnull __buffer, size_t __buffer_size) __INTRODUCED_IN(28);
+__nodiscard int getentropy(void* _Nonnull __buffer, size_t __buffer_size) __INTRODUCED_IN(28);
 
 __END_DECLS