message: cmake: add for WITH_REVB cmake option
diff: @@ -21,6 +21,7 @@ which will generate all the necessary recipes for building and installing. Usefu
  | CMAKE_PREFIX_PATH | \<path\> | Empty | Specifies a path which will be used by the FIND_XXX() commands |
  | CMAKE_INSTALL_PREFIX | \<path\> | /usr/local on UNIX, c:/Program Files on Windows | Installation directory used by `cmake install` |
  | PYTHON_EXECUTABLE | \<path\> | Path to default python executable used | Specify which python executable should be used for building the python bindings |
  +| WITH_REVB | on/off | off | When building for raspberry pi platforms, specify WITH_REVB if you are using hardware revision B, else leave it off |
  #### Building and Installing
  