upgrade faiss #7

[gensmusic]

@Enet4
This is the first basic patch.
some changes

1. upgrade to faiss: 2ac91ad79d9b82800804e073b13a64223cdd6727
2. bindgen add --size_t-is-usize, since bindgen change the size_t convertion. This leads a minor change of Index trait. see remove_ids()
3. adapt to the Clustering class changes.

[Enet4]

Sorry for the delay, but so far I haven't managed to build the respective Faiss version on my machine (probably a CUDA or GCC mismatch, will continue trying). In the meantime, I took the liberty of reviewing this code in terms of API design.

[gensmusic]

I prefer the repr(transparent) way, but FaissClusteringIterationStats(_H) is an opaque type which size is 0.

#[repr(C)]
pub struct FaissClusteringIterationStats_H {
    _unused: [u8; 0],
}

repr(transparent) require non-zero-size T,therefore I cannot use a tuple struct wrapper.

#[repr(transprent)]
pub struct ClusteringIterStats(FaissClusteringIterationStats)
// got error[E0690]: transparent struct needs exactly one non-zero-sized field, but has 0

Since FaissClusteringIterationStats(_H) is an opaque type, I mannually create a ClusteringIterationStats same as FaissClusteringIterationStats(_H).

[gensmusic]

you can review the changes in 843c1a4

[Enet4]

Right, those changes are OK! I somehow assumed that FaissClusteringIterationStats was a record type rather than an opaque type.

This is good to merge. I'll try to throw in a new crate release (0.9.0) within the next few days. Thank you very much!