message: cmake: remove unneded version define
  It looks like this was not needed anymore.
diff: @@ -55,9 +55,7 @@ execute_process(
  )
  STRING(REGEX REPLACE v\([0-9]+.[0-9]+.[0-9]+.*$\) \\1 VERSION_STR "${VERSION_STR}")
  -
  message(STATUS "Version: ${VERSION_STR}")
  -add_definitions(-DDRONECODE_SDK_VERSION="${VERSION_STR}")
  add_subdirectory(core)
  add_subdirectory(plugins)
  