Omit argon2 prebuilds

Since we build from source, these are dead weight.

It also ensures we did in fact build from source.

ci/build/build-release.sh

@@ -79,7 +79,15 @@ EOF
   mv npm-shrinkwrap.json "$RELEASE_PATH"
 
   if [ "$KEEP_MODULES" = 1 ]; then
-    rsync node_modules/ "$RELEASE_PATH/node_modules"
+    local rsync_opts=()
+    if [[ ${DEBUG-} = 1 ]]; then
+      rsync_opts+=(-vh)
+    fi
+    # If we build from source, exclude the prebuilds.
+    if [[ ${npm_config_build_from_source-} = true ]]; then
+      rsync_opts+=(--exclude /argon2/prebuilds)
+    fi
+    rsync "${rsync_opts[@]}" node_modules/ "$RELEASE_PATH/node_modules"
     # Remove dev dependencies.
     pushd "$RELEASE_PATH"
     npm prune --production