message: Improve disableMetrics propagation when consuming CMakeLists directly
diff: cmake_minimum_required(VERSION 3.3)
  project(vcpkg C CXX)
  -OPTION(DEFINE_DISABLE_METRICS "Option for disabling metrics" "0")
  +OPTION(DEFINE_DISABLE_METRICS "Option for disabling metrics" OFF)
  if(CMAKE_COMPILER_IS_GNUXX OR CMAKE_CXX_COMPILER_ID MATCHES "GNU")
  set(GCC 1)
  @@ -32,8 +32,14 @@ endif()
  file(GLOB_RECURSE VCPKGLIB_SOURCES src/vcpkg/*.cpp)
  +if (DEFINE_DISABLE_METRICS)
  + set(DISABLE_METRICS_VALUE "1")
  +else()
  + set(DISABLE_METRICS_VALUE "0")
  +endif()
  +
  add_executable(vcpkg src/vcpkg.cpp ${VCPKGLIB_SOURCES})
  -target_compile_definitions(vcpkg PRIVATE -DDISABLE_METRICS=${DEFINE_DISABLE_METRICS})
  +target_compile_definitions(vcpkg PRIVATE -DDISABLE_METRICS=${DISABLE_METRICS_VALUE})
  target_include_directories(vcpkg PRIVATE include)
  if(GCC)
  