tools: Drop cryptotest

This has been supplanted by cryptocheck and has bitrotted to the point
where it no longer builds.

PR: 289325
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D52399

(cherry picked from commit 4c6cf6107b824f7ba4a3fe66db8e0a36c8dd8b04)