Issue 6063, 6531 - Update V8 to 6.5.254.41, use C++14 and NDK-r16b

Makefile

 V8_DIR :=$(shell pwd -L)/third_party/v8/
 HOST_ARCH :=$(shell python third_party/detect_v8_host_arch.py)
 
 GYP_PARAMETERS=host_arch=${HOST_ARCH}
 
 ifndef HOST_OS
   raw_OS = $(shell uname -s)
   ifeq (${raw_OS},Linux)
     HOST_OS=linux
   else ifeq (${raw_OS},Darwin)
@@ skipping 110 matching lines @@
 v8_android_multi_mac_arm: v8_android_multi
         find ${BUILD_DIR}/android_arm.release/ -depth 1 -iname \*.a -exec ${ANDROID_NDK_ROOT}/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-ranlib {} \;
 
 v8_android_multi_mac_arm64: v8_android_multi
         find ${BUILD_DIR}/android_arm64.release/ -depth 1 -iname \*.a -exec ${ANDROID_NDK_ROOT}/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-ranlib {} \;
 
 build-v8-android: v8_android_multi_${HOST_OS}_${ANDROID_ARCH}
 
 android_multi: ${BUILD_V8} ensure_dependencies
         GYP_DEFINES="${GYP_PARAMETERS} ${ABP_GYP_PARAMETERS}" \
-        python ./make_gyp_wrapper.py --depth=. -f make-android -Ilibadblockplus.gypi --generator-output=${BUILD_DIR} -Gandroid_ndk_version=r12b libadblockplus.gyp
+        python ./make_gyp_wrapper.py --depth=. -f make-android -Ilibadblockplus.gypi --generator-output=${BUILD_DIR} -Gandroid_ndk_version=r16b libadblockplus.gyp
         $(ANDROID_NDK_ROOT)/ndk-build -C ${BUILD_DIR} installed_modules \
         BUILDTYPE=Release \
         APP_ABI=$(ANDROID_ABI) \
         APP_PLATFORM=${ANDROID_PLATFORM_LEVEL} \
         APP_PIE=true \
         APP_STL=c++_static \
         APP_BUILD_SCRIPT=Makefile \
         NDK_PROJECT_PATH=. \
         NDK_OUT=. \
+        LOCAL_DISABLE_FATAL_LINKER_WARNINGS=true \
+        LOCAL_LDFLAGS="-Wl,--allow-multiple-definition" \
         NDK_APP_DST_DIR=$(ANDROID_DEST_DIR)
 endif