Support vendoring

[skr4n]

• Add a new feature vendored along with an opt-out env variable LIBCDIO_NO_VENDOR.
  • The default is to use system libraries and fallback to vendored builds if that fails.
• Use the crate's version metadata to indicate libcdio's version. v3.0.0+2.3.0p2.0.0
  • Make vendored builds to provide this exact version.
  • Make non-vendored builds use this as a lower bound when probing the system.
• Update the CI to test vendored builds.

Closes #8

[skr4n]

Also, updated libcdio to 2.4.0.

[MonterraByte]

Just a few minor things left.

[MonterraByte]

Thanks!

By the way, would you be interested in moving this repo into the libcdio org?

[skr4n]

Thanks!

By the way, would you be interested in moving this repo into the libcdio org?

Sure!
I've notified the org owner.

[skr4n]

Thanks!
By the way, would you be interested in moving this repo into the libcdio org?

Sure! I've notified the org owner.

You've been invited to the libcdio org and may move the repository.

[MonterraByte]

Repo has been moved.

It would probably be a good idea to share access to the crates.io package. Which account(s) should I add to the owners list?

[skr4n]

You may add me and rocky, the author of libcdio.

[MonterraByte]

I've added you. Couldn't add Rocky since they haven't linked their GitHub account to crates.io.

[rocky]

@MonterraByte, would you mind renaming this repository to something that indicates this is for Rust? For example, rust-libcdio-sys (or libcdio-sys-rust, or something).

I've had this discussion with @skr4n, and I realize that in the Rust community and in Rust crates, libcdio-sys is standard convention. However, that does not mean that GitHub repositories should have the same name. In fact, there are situations where I think it is better to have them be slightly different, so that in conversations, giving one name clearly indicates whether a repository name or a Rust package name is intended.

I will probably rename the libcdio C library GitHub repository to C-libcdio or libcdio-C or something like that.

Also, this probably would be best brought up as a discussion rather than here. But discussions haven't been set up and I didn't want to add that without checking with you first. See:

[rocky]

I've added you. Couldn't add Rocky since they haven't linked their GitHub account to crates.io.

I have now linked my account to GitHub. Thanks.