libutils: Fix integer overflows in VectorImpl.

Use external/safe-iop to check for overflows on arithmetic
operations.

Also remove an unnecessary copy of Vector/SharedBuffer from
codeflinger and use the copy from libutils instead.

Note that some of the unit tests are somewhat useless due to
test-runner limitations : gtest's ability to filter on abort message
doesn't work when combined with messages formatted by android's logging
system.

bug: 22953624

Change-Id: I46b1ae8ca1f3a010be13aca36a091e76a97a7b70
diff --git a/libutils/tests/Android.mk b/libutils/tests/Android.mk
index 7cfad89..d4a45fd 100644
--- a/libutils/tests/Android.mk
+++ b/libutils/tests/Android.mk
@@ -38,3 +38,11 @@
     libutils \
 
 include $(BUILD_NATIVE_TEST)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libutils_tests_host
+LOCAL_SRC_FILES := Vector_test.cpp
+LOCAL_STATIC_LIBRARIES := libutils liblog
+
+include $(BUILD_HOST_NATIVE_TEST)