Migrate lazy_static to once_cell, less macro magic and slightly faster

src/api/icons.rs

@@ -1,3 +1,4 @@
+use once_cell::sync::Lazy;
 use std::fs::{create_dir_all, remove_file, symlink_metadata, File};
 use std::io::prelude::*;
 use std::net::ToSocketAddrs;
@@ -26,16 +27,16 @@ const FALLBACK_ICON: &[u8; 344] = include_bytes!("../static/fallback-icon.png");
 
 const ALLOWED_CHARS: &str = "_-.";
 
-lazy_static! {
+static CLIENT: Lazy<Client> = Lazy::new(|| {
     // Reuse the client between requests
-    static ref CLIENT: Client = Client::builder()
+    Client::builder()
         .use_sys_proxy()
         .gzip(true)
         .timeout(Duration::from_secs(CONFIG.icon_download_timeout()))
         .default_headers(_header_map())
         .build()
-        .unwrap();
-}
+        .unwrap()
+});
 
 fn is_valid_domain(domain: &str) -> bool {
     // Don't allow empty or too big domains or path traversal