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Unhelpful error message when compiling with default features off #94

Description

@vi

If v4l crate expects user to enable either libv4l or v4l2 features then there should probably be some #[cfg(...)] comile_error!() stating this if none or both of the features are enabled.

Now I get something like:

error[E0432]: unresolved import `crate::v4l_sys`
 --> /home/vi/.cargo/registry/src/-3d9d141e372ea94e/v4l-0.14.0/src/v4l2/videodev.rs:1:12
  |
1 | use crate::v4l_sys::v4l2_ext_control;
  |            ^^^^^^^ could not find `v4l_sys` in the crate root

(many similar compiler errors)

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