message: Move RTK binaries to RTK binary directory
  When building RTK against an ITK build directory, RTK binaries
  go into the RTK binary directory.
  When building RTK within ITK, RTK binaries are located in the ITK
  binary directory.
diff: @@ -177,6 +177,17 @@ list(APPEND RTK_INCLUDE_DIRS
  list(APPEND RTK_INCLUDE_DIRS
  ${RTK_BINARY_DIR})
  +# Setup build locations.
  +if(NOT CMAKE_RUNTIME_OUTPUT_DIRECTORY)
  + set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${RTK_BINARY_DIR}/bin)
  +endif()
  +if(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
  + set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${RTK_BINARY_DIR}/lib)
  +endif()
  +if(NOT CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
  + set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${RTK_BINARY_DIR}/lib)
  +endif()
  +
  # Export library linking directories (used by LIBPATH)
  set(RTK_SYSTEM_LIBRARY_DIRS ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
  set(RTK_SYSTEM_INCLUDE_DIRS ${RTK_INCLUDE_DIRS})
  