Remove unnecessary typenames from std/numerics/c.math/abs.pass.cpp

[• wash]

Summary

There are some unnecessary typenames in std/numerics/c.math/abs.pass.cpp; e.g. they're not in dependent code.

[ldionne]

Thanks!

libcxx/test/std/numerics/c.math/abs.pass.cpp

 {
     // On some systems char is unsigned.
     // If that is the case, we should just test signed char twice.
-    typedef typename std::conditional<
+    typedef std::conditional<
         std::is_signed<char>::value, char, signed char
     >::type SignedChar;
 

 
     // Here there is no guarantee that int is larger than int8_t so we
     // use a helper type trait to conditional test against int.
-    test_abs<std::int8_t, typename correct_size_int<std::int8_t>::type>();
-    test_abs<std::int16_t, typename correct_size_int<std::int16_t>::type>();
-    test_abs<std::int32_t, typename correct_size_int<std::int32_t>::type>();
-    test_abs<std::int64_t, typename correct_size_int<std::int64_t>::type>();
+    test_abs<std::int8_t, correct_size_int<std::int8_t>::type>();
+    test_abs<std::int16_t, correct_size_int<std::int16_t>::type>();
+    test_abs<std::int32_t, correct_size_int<std::int32_t>::type>();
+    test_abs<std::int64_t, correct_size_int<std::int64_t>::type>();
 
     test_abs<long double, long double>();
     test_abs<double, double>();