Refactor build scripts.

substrate/polkadot/parachain/test-chains/basic_add/build.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+
+# Make LLD produce a binary that imports memory from the outside environment.
+export RUSTFLAGS="-C link-arg=--import-memory"
+
+cargo +nightly build --target=wasm32-unknown-unknown --release --no-default-features
+
+for i in basic_add
+do
+	wasm-gc target/wasm32-unknown-unknown/release/$i.wasm target/wasm32-unknown-unknown/release/$i.compact.wasm
+done

substrate/polkadot/parachain/test-chains/build.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 
 rm -rf ./target