one ifdef hadn't been renamed

git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@1632 e5f2f494-b856-4b98-b285-d166d9295462

src/bin/auth/main.cc

@@ -136,7 +136,7 @@ dispatch_axfr_query(int tcp_sock, char axfr_query[], uint16_t query_len)
     }
 }
 
-#ifdef HAVE_BOOSTLIB
+#ifdef HAVE_BOOST_SYSTEM
 //
 // Helper classes for asynchronous I/O using boost::asio
 //