message: cmake: fix iOS build with CMake 3.10
diff: @@ -92,6 +92,13 @@ endif()
  if(NOT __IN_TRY_COMPILE)
  set(_xcodebuild_wrapper "${CMAKE_BINARY_DIR}/xcodebuild_wrapper")
  + if(NOT DEFINED CMAKE_MAKE_PROGRAM) # empty since CMake 3.10
  + find_program(XCODEBUILD_PATH "xcodebuild")
  + if(NOT XCODEBUILD_PATH)
  + message(FATAL_ERROR "Specify CMAKE_MAKE_PROGRAM variable ('xcodebuild' absolute path)")
  + endif()
  + set(CMAKE_MAKE_PROGRAM "${XCODEBUILD_PATH}")
  + endif()
  if(NOT CMAKE_MAKE_PROGRAM STREQUAL _xcodebuild_wrapper)
  if(APPLE_FRAMEWORK AND BUILD_SHARED_LIBS)
  set(_xcodebuild_wrapper_tmp "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/xcodebuild_wrapper")
  