clippy: "oldcpu" feature doesn't exist anymore. remove deadcode.

Author: phlip9

src/lib.rs

@@ -1,11 +1,5 @@
 #![recursion_limit = "1024"]
 
-// See https://github.com/romanz/electrs/issues/193 & https://github.com/rust-rocksdb/rust-rocksdb/issues/327
-#[cfg(not(feature = "oldcpu"))]
-extern crate rocksdb;
-#[cfg(feature = "oldcpu")]
-extern crate rocksdb_oldcpu as rocksdb;
-
 #[macro_use]
 extern crate clap;
 #[macro_use]

src/new_index/db.rs

@@ -163,10 +163,7 @@ impl DB {
         rows.sort_unstable_by(|a, b| a.key.cmp(&b.key));
         let mut batch = rocksdb::WriteBatch::default();
         for row in rows {
-            #[cfg(not(feature = "oldcpu"))]
             batch.put(&row.key, &row.value);
-            #[cfg(feature = "oldcpu")]
-            batch.put(&row.key, &row.value).unwrap();
         }
         let do_flush = match flush {
             DBFlush::Enable => true,