message: gapi: eliminate KW issues
diff: #if !defined(GAPI_STANDALONE)
  #include <opencv2/core/base.hpp>
  -#define GAPI_Assert(expr) CV_Assert(expr)
  +#define GAPI_Assert CV_Assert
  +#define GAPI_DbgAssert CV_DbgAssert
  #else
  #include <stdexcept>
  @@ -30,7 +31,6 @@ namespace detail
  #define GAPI_Assert(expr) \
  { if (!(expr)) ::detail::assert_abort(#expr, __LINE__, __FILE__, __func__); }
  -#endif
  #ifdef NDEBUG
  # define GAPI_DbgAssert(expr)
  @@ -38,4 +38,6 @@ namespace detail
  # define GAPI_DbgAssert(expr) GAPI_Assert(expr)
  #endif
  +#endif // GAPI_STANDALONE
  +
  #endif // OPENCV_GAPI_OWN_ASSERT_HPP
  