Jamyw7g

[OPENCV_LINK_LIBS](https://github.com/twistedfall/opencv-rust#environment-variables) may not be convenient. `features` may be very straightforward and convenient. Maybe my implementation is not very well yet. I think you can consider it.

> In my opinion, there are two reasons, one is to reduce the use of macros, and the other is that the use of third-party crate require to audit. So...