EmbeddedConcurrency: don't use -c release for SwiftSyntax

Remove the '-c release' option from the build command.

Author: MaxDesiatov

Examples/EmbeddedConcurrency/build.sh

@@ -3,5 +3,5 @@ set -euxo pipefail
 package_dir="$(cd "$(dirname "$0")" && pwd)"
 swift package --package-path "$package_dir" \
   --swift-sdk "${SWIFT_SDK_ID_wasm32_unknown_wasip1:-${SWIFT_SDK_ID:-wasm32-unknown-wasip1}}-embedded" \
-  js --default-platform node -c release
+  js --default-platform node
 node "$package_dir/run.mjs"