Fix warnings in test/std/algorithms

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@242626 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp

@@ -19,10 +19,11 @@
 #include <functional>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 #include "counting_predicates.hpp"
 
-#if _LIBCPP_STD_VER > 11
+#if TEST_STD_VER > 11
 #define HAS_FOUR_ITERATOR_VERSION
 #endif
 
@@ -31,7 +32,7 @@ int main()
     int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
     int ib[] = {0, 1, 2, 3, 0, 1, 2, 3};
-    const unsigned sb = sizeof(ib)/sizeof(ib[0]);
+    const unsigned sb = sizeof(ib)/sizeof(ib[0]); ((void)sb); // unused in c++11
     
     typedef input_iterator<const int*> II;
     typedef random_access_iterator<const int*>  RAI;