Fix sover detection for 0-based versioning

[kpcyrd]

Related to #345

With this patch applied Arch Linux generates this metadata (emphasis on Provides):

Name            : librustls
Version         : 0.11.0-1
Description     : Use rustls from languages other than Rust
Architecture    : x86_64
URL             : https://github.com/rustls/rustls-ffi
Licenses        : Apache-2.0  MIT
Groups          : None
Provides        : librustls.so=0.11-64

[lu-zero]

Sounds good, thank you :)

[decathorpe]

FYI, introducing this change in a cargo-c patch release kind of "broke" builds of rav1e for Fedora Linux - I will need to patch rav1e to include the version_suffix_components=1 setting (and update cargo-c to the latest version) to maintain compatibility with older builds (which used .so.0), since changing the SONAME breaks installability of packages that dynamically link with rav1e (similar to the problem pointed out by the Arch maintainer). Changing the default behaviour here in a breaking way without bumping at least the "minor" release of cargo-c is kind of unexpected, at least to me.

[lu-zero]

I'll prepare a new rav1e release soon and that will at least take care of it, thank you for the headsup.

I'll bump cargo-c as well soon. Sadly before this change (and the following) one may argue the previous situation might lead to subtly broken situations =/