set link-arg --export-table for wasm builds (#1598)

substrate/core/executor/wasm/Cargo.lock

@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "arrayvec"
 version = "0.4.7"

substrate/core/executor/wasm/build.sh

@@ -6,7 +6,7 @@ if cargo --version | grep -q "nightly"; then
 else
 	CARGO_CMD="cargo +nightly"
 fi
-$CARGO_CMD build --target=wasm32-unknown-unknown --release
+RUSTFLAGS="-C link-arg=--export-table" $CARGO_CMD build --target=wasm32-unknown-unknown --release
 for i in test
 do
 	wasm-gc target/wasm32-unknown-unknown/release/runtime_$i.wasm target/wasm32-unknown-unknown/release/runtime_$i.compact.wasm