message: [cmake] supress error message of getting git revision
diff: @@ -64,7 +64,7 @@ message(STATUS "Name: ${OTBR_NAME}")
  if(NOT OTBR_VERSION)
  execute_process(
  - COMMAND git describe --dirty --always
  + COMMAND git describe --dirty --always 2>/dev/null
  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
  OUTPUT_VARIABLE OTBR_GIT_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE
  )
  