fix unstrip_libc

[polka125]

Hi! The PR closes the issue #306

The problem that the deb packages have different structure, and different methods of locating the debug symbols neede. Currenly a heuristic is used

let name = if version_compare::compare_to(&ver.string_short, "2.34", Cmp::Lt).unwrap()

It does not always work, for instance this https://launchpad.net/ubuntu/+archive/primary/+files//libc6-dbg_2.31-0ubuntu9.18_amd64.deb package breaks the logic.

In the patch I suggest simply trying to locate the libc file in both ways