Fix compiler warnings (#2579)

config/src/config.rs

@@ -46,6 +46,7 @@ const GRIN_HOME: &'static str = ".grin";
 const GRIN_CHAIN_DIR: &'static str = "chain_data";
 /// Wallet data directory
 pub const GRIN_WALLET_DIR: &'static str = "wallet_data";
+/// API secret file name
 pub const API_SECRET_FILE_NAME: &'static str = ".api_secret";
 
 fn get_grin_path(chain_type: &global::ChainTypes) -> Result<PathBuf, ConfigError> {

src/bin/cmd/server.rs

@@ -13,8 +13,6 @@
 // limitations under the License.
 
 /// Grin server commands processing
-#[cfg(not(target_os = "windows"))]
-use std::env::current_dir;
 use std::process::exit;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;