update CI configs to show warning about deprecated V8 API.

Author: abby-sergz

.travis.yml

@@ -24,6 +24,7 @@ env:
   global:
   - URL_PREFIX=https://v8.eyeofiles.com/v8-4fc9a2fe7f8a7ef1e7966185b39b3b541792669a/
   - ANDROID_NDK_ROOT=${TRAVIS_BUILD_DIR}/third_party/android-ndk-r16b
+  - libv8_show_warnings="true"
   matrix:
   - BUILD_ACTION=test
   - BUILD_ACTION=all TARGET_OS=android Configuration=release ABP_TARGET_ARCH=arm

appveyor.yml

@@ -18,7 +18,7 @@ install:
 environment:
   URL_PREFIX: https://v8.eyeofiles.com/v8-4fc9a2fe7f8a7ef1e7966185b39b3b541792669a/
 before_build:
-- cmd: set "GYP_DEFINES=libv8_include_dir=third_party/prebuilt-v8/include libv8_lib_dir=../../third_party/prebuilt-v8"
+- cmd: set "GYP_DEFINES=libv8_include_dir=third_party/prebuilt-v8/include libv8_lib_dir=../../third_party/prebuilt-v8 libv8_show_warnings=\"true\""
 - cmd: createsolution.bat
 - cmd: >-
     if "%Platform%"=="Win32" set arch="ia32"