fix linux compile. addresses #1765

git-svn-id: file:///svn/toku/tokudb@12083 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/threadpool.c

@@ -5,6 +5,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <string.h>
 
 #include <toku_portability.h>
 #include "toku_pthread.h"