build: do not build icu for chakracore-master

chakracore relies on `windows.globalization.dll` for `Intl` and
doesn't really need icu projects built.

PR-URL: #76
Reviewed-By: Jianchun Xu <Jianchun.Xu@microsoft.com>

vcbuild.bat

@@ -114,6 +114,7 @@ if "%i18n_arg%"=="full-icu" set configure_flags=%configure_flags% --with-intl=fu
 if "%i18n_arg%"=="small-icu" set configure_flags=%configure_flags% --with-intl=small-icu
 if "%i18n_arg%"=="intl-none" set configure_flags=%configure_flags% --with-intl=none
 if "%i18n_arg%"=="without-intl" set configure_flags=%configure_flags% --without-intl
+if "%engine%"=="chakracore" set configure_flags=%configure_flags% --without-intl
 
 if defined config_flags set configure_flags=%configure_flags% %config_flags%