Fix protobuf-host location

Author: rbsheth

cmake/protobuf-host/CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.0)
 
 # Emulate HunterGate:
 # * https://github.com/hunter-packages/gate
-include(${CMAKE_CURRENT_SOURCE_DIR}/../../../../gate/cmake/HunterGate.cmake)
+include(${CMAKE_CURRENT_LIST_DIR}/../HunterGate.cmake)
 HunterGate(URL "${HUNTER_HOST_URL}" SHA1 "${HUNTER_HOST_SHA1}")
 
 project(download-Protobuf-host)