Update NDK gtest lib names.

The NDK gtest libs are always suffixed to simplify the make macro
that generates the test modules.

Bug: http://b/16574165
Change-Id: I1c9647e90aff2f1e9da4a88cad30199b1e423757
diff --git a/core/target_test_internal.mk b/core/target_test_internal.mk
index 1a22510..2e65218 100644
--- a/core/target_test_internal.mk
+++ b/core/target_test_internal.mk
@@ -8,13 +8,13 @@
     LOCAL_STATIC_LIBRARIES += libgtest_main libgtest
 else
     ifneq (,$(filter c++_%,$(LOCAL_NDK_STL_VARIANT)))
-        my_ndk_gtest_suffix := _libcxx
+        my_ndk_gtest_suffix := _c++
     else ifneq ($(filter stlport_,$(LOCAL_NDK_STL_VARIANT)),)
-        my_ndk_gtest_suffix :=
+        my_ndk_gtest_suffix := _stlport
     else ifneq ($(filter gnustl_,$(LOCAL_NDK_STL_VARIANT)),)
         my_ndk_gtest_suffix := _gnustl
     else # system STL, use stlport
-        my_ndk_gtest_suffix :=
+        my_ndk_gtest_suffix := _stlport
     endif
     LOCAL_STATIC_LIBRARIES += \
         libgtest_main_ndk$(my_ndk_gtest_suffix) \