message: Remove unnecessary C++11 selection code.
  Looks like a leftover from the example CMake-file we were
  looking at initially.
  With or without this part, the generated Makefiles look exactly
  the same.
diff: @@ -57,32 +57,6 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-builtin-malloc -fno-builtin-calloc
  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free -O0 -g ${MY_CXX_WARNING_FLAGS}")
  set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free -O3 -DNDEBUG ${MY_CXX_WARNING_FLAGS}")
  -# Compiler-specific C++11 activation.
  -if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Intel")
  - execute_process(
  - COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
  - # Just g++-5.0 and greater contain <codecvt> header. (test in ubuntu)
  - if (NOT (GCC_VERSION VERSION_GREATER 5.0 OR GCC_VERSION VERSION_EQUAL 5.0))
  - message(FATAL_ERROR "${PROJECT_NAME} requires g++ 5.0 or greater.")
  - endif ()
  -elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" AND APPLE)
  - set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
  -elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" AND CMAKE_SYSTEM_NAME MATCHES "Linux")
  - execute_process(
  - COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE CLANG_VERSION)
  - if (NOT (CLANG_VERSION VERSION_GREATER 4.2.1 OR CLANG_VERSION VERSION_EQUAL 4.2.1))
  - message(FATAL_ERROR "${PROJECT_NAME} requires clang 4.2.1 or greater.")
  - endif ()
  - # You can use libc++ to compile this project when g++ is NOT greater than or equal to 5.0.
  - if (WITH_LIBCXX)
  - set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
  - endif()
  -elseif ( MSVC_VERSION GREATER 1800 OR MSVC_VERSION EQUAL 1800 )
  - # Visual Studio 2012+ supports c++11 features
  -else ()
  - message(FATAL_ERROR "Your C++ compiler does not support C++11.")
  -endif ()
  -
  # Flatbuffer
  set(flatbuffer-GENERATED_SRC
  ${PROJECT_SOURCE_DIR}/src/Cache/header_generated.h
  