Fix garage_db build on 32-bit systems

src/db/bin/convert.rs

@@ -55,14 +55,7 @@ fn open_db(path: PathBuf, engine: String) -> Result<Db> {
 				Error(format!("Unable to create LMDB data directory: {}", e).into())
 			})?;
 
-			let map_size = if u32::MAX as usize == usize::MAX {
-				eprintln!(
-					"LMDB is not recommended on 32-bit systems, database size will be limited"
-				);
-				1usize << 30 // 1GB for 32-bit systems
-			} else {
-				1usize << 40 // 1TB for 64-bit systems
-			};
+			let map_size = lmdb_adapter::recommended_map_size();
 
 			let db = lmdb_adapter::heed::EnvOpenOptions::new()
 				.max_dbs(100)