test/type_traits: Convert to gtest

This is a fairly minimal and non-invasive change. This test doesn't
really require the googletest framework since it is just using
static_asserts. However, this moves us toward uniform testing.

Change-Id: I35d507cf6c97384146120d4f8f1b5a2e52834a6d
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/Makefile.am b/test/Makefile.am
index 442d084..b7b6a03 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -52,8 +52,7 @@
 
 check_PROGRAMS += utility_type_traits
 utility_type_traits_SOURCES = utility/type_traits.cpp
-utility_type_traits_CXXFLAGS = $(legacy_test_cxxflags)
-utility_type_traits_LDADD = $(legacy_test_ldadd)
+utility_type_traits_LDADD = $(gtest_ldadd)
 
 check_PROGRAMS += vtable_vtable
 vtable_vtable_SOURCES = vtable/vtable.cpp vtable/vtable_c.c