remove use statements from main.rs that temporary replaced extern crate and fixed paths that previously used them

src/main.rs

@@ -1,24 +1,3 @@
-use blake2;
-use chrono;
-use cpu_time;
-use crossterm;
-use divrem;
-use downcast;
-use git_version;
-use indexmap;
-use lazy_static;
-use native_tls;
-use nix::sys::signal;
-use openssl;
-use ordered_float;
-use prolog_parser_rebis;
-use ref_thread_local;
-use ring;
-use ripemd160;
-use rustyline;
-use sha3;
-use unicode_reader;
-
 #[cfg(feature = "num-rug-adapter")]
 use num_rug_adapter as rug;
 #[cfg(feature = "rug")]
@@ -47,6 +26,7 @@ use machine::streams::*;
 use machine::*;
 use read::*;
 
+use nix::sys::signal;
 use std::sync::atomic::Ordering;
 
 extern "C" fn handle_sigint(signal: libc::c_int) {