removed redundant evm deps (#6757)

ethcore/evm/src/lib.rs

@@ -16,16 +16,10 @@
 
 //! Ethereum virtual machine.
 
-extern crate byteorder;
 extern crate bit_set;
-extern crate common_types as types;
 extern crate ethcore_util as util;
 extern crate ethcore_bigint as bigint;
-extern crate ethjson;
-extern crate rlp;
 extern crate parking_lot;
-extern crate wasm_utils;
-extern crate ethcore_logger;
 extern crate heapsize;
 extern crate vm;
 extern crate hash;