Resolve these Lintian warning:
W: softether: package-name-doesnt-match-sonames libsoftether
W: softether: shlib-without-versioned-soname usr/lib/x86_64-linux-gnu/libsoftether.so libsoftether.so
The library interface is entirely private and provided only for build
convenience and runtime optimization. The sonames are not versioned
because the interface is not contracted.
