message: cmake: set the minimum version before the project call
diff: -project(pugixml)
  -
  cmake_minimum_required(VERSION 2.8.12)
  +project(pugixml)
  +
  option(BUILD_SHARED_LIBS "Build shared instead of static library" OFF)
  option(BUILD_TESTS "Build tests" OFF)
  option(BUILD_PKGCONFIG "Build in PKGCONFIG mode" OFF)
  