new dependency on libelf is not captured in package

We added the dependency on libelf-dev into the debian/control file, but the downstream clients are now getting a linker error if libelf is not installed. Obviously this needs to be fixed.

The easy fix is to add a dependency in the deb on libelf1, but I would much rather have statically linked libelf.a. However, that package doesn't compile with -fPIC.

The same question probably goes for rpm, but I haven't tested that yet.

@vmg can you look into this, and see if somehow we can do it statically?