Clean up use to keep rust 1.43.0 from complaining (#9740)

programs/btc_spv/src/spv_processor.rs

@@ -4,7 +4,6 @@ use crate::spv_instruction::*;
 use crate::spv_state::*;
 #[allow(unused_imports)]
 use crate::utils::*;
-use hex;
 use log::*;
 use solana_sdk::account::KeyedAccount;
 use solana_sdk::instruction::InstructionError;

programs/btc_spv_bin/src/block.rs

@@ -1,7 +1,4 @@
-use clap;
 use clap::{App, Arg};
-use hex;
-use reqwest;
 use std::fs::File;
 use std::io::prelude::*;
 

programs/btc_spv_bin/src/blockheade.rs

@@ -1,6 +1,4 @@
-use clap;
 use clap::{App, Arg};
-use reqwest;
 use serde_derive::Deserialize;
 
 // pub type blockHash = [u8; 32];