message: fixing cmake warning
diff: cmake_minimum_required(VERSION 2.8.7)
  project(DuckDB)
  -
  find_package(Threads REQUIRED)
  +
  set(CMAKE_CXX_STANDARD 11)
  set(CMAKE_VERBOSE_MAKEFILE off)
  -
  set(CMAKE_POSITION_INDEPENDENT_CODE ON)
  -
  +set(CMAKE_MACOSX_RPATH 1)
  set(CMAKE_CXX_FLAGS_DEFAULT "-O0 -g")
  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g -O0 -fsanitize=address -DDEBUG")
  