Remove messed up bridges subtree

polkadot/bridges/bin/rialto/runtime/build.rs

@@ -1,26 +0,0 @@
-// Copyright 2019-2020 Parity Technologies (UK) Ltd.
-// This file is part of Parity Bridges Common.
-
-// Parity Bridges Common is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// Parity Bridges Common is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
-
-use wasm_builder_runner::WasmBuilder;
-
-fn main() {
-	WasmBuilder::new()
-		.with_current_project()
-		.with_wasm_builder_from_crates("1.0.11")
-		.export_heap_base()
-		.import_memory()
-		.build()
-}