[t:4431], remove unnecessary attribute

git-svn-id: file:///svn/toku/tokudb@42762 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/brt-cachetable-wrappers.h

@@ -72,7 +72,7 @@ toku_pin_brtnode(
     BOOL apply_ancestor_messages, // this BOOL is probably temporary, for #3972, once we know how range query estimates work, will revisit this
     BRTNODE *node_p,
     BOOL* msgs_applied
-    ) __attribute__((__warn_unused_result__));
+    );
 
 /**
  * see comments for toku_pin_brtnode