Make BindgenOptions be pub(crate)

[fitzgen]

Its public use has been deprecated for a while now, and it is only meant for internal use.

[highfive]

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[pepyakin]

@highfive: assign me
@fitzgen

https://github.com/rust-lang-nursery/rust-bindgen/blob/ab6d51bb431665b53ec0c0d2370cd1f3d0e372f6/src/lib.rs#L10-L12

This comment actually is not accurate, because deprecated Bindings::generate is used here:

https://github.com/rust-lang-nursery/rust-bindgen/blob/ab6d51bb431665b53ec0c0d2370cd1f3d0e372f6/src/lib.rs#L1015

Should I also make it pub(crate)?

[highfive]

Hey @pepyakin! Thanks for your interest in working on this issue. It's now assigned to you!