message: Fix linkage in standalone mode
diff: #include "precomp.hpp"
  -#if !defined(GAPI_STANDALONE)
  -
  #include <ade/graph.hpp>
  #include <opencv2/gapi/gproto.hpp> // can_describe
  @@ -147,5 +145,3 @@ cv::GStreamingCompiled::Priv& cv::GStreamingCompiled::priv()
  {
  return *m_priv;
  }
  -
  -#endif // GAPI_STANDALONE
  