Issue 6695 - Allow automatically downloading V8

Makefile

Index: Makefile
===================================================================
--- a/Makefile
+++ b/Makefile
@@ -1,19 +1,25 @@
 HOST_ARCH :=$(shell python third_party/detect_v8_host_arch.py)
 
 ifndef HOST_OS
   raw_OS = $(shell uname -s)
   ifeq (${raw_OS},Linux)
     HOST_OS=linux
+    TRAVIS_OS_NAME=linux
   else ifeq (${raw_OS},Darwin)
     HOST_OS=mac
+    TRAVIS_OS_NAME=osx
   endif
 endif
 
+# Default V8 directories
+LIBV8_INCLUDE_DIR ?= $(shell pwd -L)/third_party/prebuilt-v8/include
+LIBV8_LIB_DIR ?= $(shell pwd -L)/third_party/prebuilt-v8/
+
 TARGET_OS ?= ${HOST_OS}
 TARGET_ARCH ?= ${HOST_ARCH}
 Configuration ?= debug
 
 BUILD_DIR ?=$(shell pwd -L)/build
 
 ifeq (${TARGET_OS},android)
 Configuration ?= release
@@ -61,16 +67,22 @@
 	$(TEST_EXECUTABLE) --gtest_filter=$(FILTER)
 else
 	$(TEST_EXECUTABLE)
 endif
 
 docs:
 	doxygen
 
+get-prebuilt-v8:
+	URL_PREFIX="https://v8.eyeofiles.com/v8-4fc9a2fe7f8a7ef1e7966185b39b3b541792669a/" \
+	TARGET_OS=${TARGET_OS} TARGET_ARCH=${TARGET_ARCH} \
+	TRAVIS_OS_NAME=${TRAVIS_OS_NAME} Configuration=${Configuration} \
+	bash .travis/prepare-prebuilt-v8.sh
+
 clean:
 	$(RM) -r ${BUILD_DIR} docs
 
 ifeq ($(TARGET_OS),android)
 all: ensure_dependencies
 	GYP_DEFINES="${GYP_PARAMETERS}" \
 	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 \