Remove step2+ stare-and-splice and peek-and-bump support (#926)

Remove step2+ stare-and-splice and peek-and-bump support (#926)

Support for these features was successfully disabled (at build time) for
five years. See commit 88a300c for the list of reasons. We did not even
provide an ./configure --enable-... option for it. The corresponding
code does not compile with modern OpenSSL versions, but its mere
presence complicates related code logic and significantly increases
related development efforts. This code is not worth keeping.

This is a Measurement Factory project.