Deprecate host-side C++ test in LatinIME

Host-side C++ test in LatinIME is no longer actively used and is
actually not compatible with Android Studio build.

Let's just remove this for now.

Bug: 13754552
Bug: 110741422
Test: compile
Change-Id: I3e81285fe559022e1a296051036e74d2f2afbf9c

native/jni/Android.mk

@@ -95,9 +95,6 @@ include $(BUILD_SHARED_LIBRARY)
 #################### Clean up the tmp vars
 include $(LOCAL_PATH)/CleanupNativeFileList.mk
 
-#################### Unit test on host environment
-include $(LOCAL_PATH)/HostUnitTests.mk
-
 #################### Unit test on target environment
 include $(LOCAL_PATH)/TargetUnitTests.mk
 //LOCAL_CFLAGS += -Wall -Werror

native/jni/HostUnitTests.mk

-# Copyright (C) 2014 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Host build is never supported in unbundled (NDK/tapas) build
-ifeq (,$(TARGET_BUILD_APPS))
-
-# HACK: Temporarily disable host tool build on Mac until the build system is ready for C++11.
-LATINIME_HOST_OSNAME := $(shell uname -s)
-ifneq ($(LATINIME_HOST_OSNAME), Darwin) # TODO: Remove this
-
-LOCAL_PATH := $(call my-dir)
-
-######################################
-include $(CLEAR_VARS)
-
-include $(LOCAL_PATH)/NativeFileList.mk
-
-#################### Host library for unit test
-LATIN_IME_SRC_DIR := src
-LOCAL_ADDRESS_SANITIZER := true
-LOCAL_CFLAGS += -Wno-unused-parameter -Wno-unused-function -Wall -Werror
-LOCAL_CXX_STL := libc++
-LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(LATIN_IME_SRC_DIR)
-LOCAL_MODULE := liblatinime_host_static_for_unittests
-LOCAL_MODULE_TAGS := optional
-LOCAL_SRC_FILES := $(addprefix $(LATIN_IME_SRC_DIR)/, $(LATIN_IME_CORE_SRC_FILES))
-include $(BUILD_HOST_STATIC_LIBRARY)
-
-#################### Host native tests
-include $(CLEAR_VARS)
-LATIN_IME_TEST_SRC_DIR := tests
-LOCAL_ADDRESS_SANITIZER := true
-LOCAL_CFLAGS += -Wno-unused-parameter -Wno-unused-function
-LOCAL_CFLAGS += -Wall -Werror
-LOCAL_CXX_STL := libc++
-LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(LATIN_IME_SRC_DIR)
-LOCAL_MODULE := liblatinime_host_unittests
-LOCAL_MODULE_TAGS := tests
-LOCAL_SRC_FILES := $(addprefix $(LATIN_IME_TEST_SRC_DIR)/, $(LATIN_IME_CORE_TEST_FILES))
-LOCAL_STATIC_LIBRARIES += liblatinime_host_static_for_unittests
-include $(BUILD_HOST_NATIVE_TEST)
-
-include $(LOCAL_PATH)/CleanupNativeFileList.mk
-
-endif # Darwin - TODO: Remove this
-
-endif # TARGET_BUILD_APPS
-
-#################### Clean up the tmp vars
-LATINIME_HOST_OSNAME :=
-LATIN_IME_SRC_DIR :=
-LATIN_IME_TEST_SRC_DIR :=