Copy correct Node into release

Still had the old code that copied the system Node, which in the case of
cross-compilation will be the wrong one.  Instead copy the one VS Code
downloads, which should be for the correct platform.

ci/build/build-release.sh

@@ -36,13 +36,6 @@ main() {
   rsync ./lib/vscode/ThirdPartyNotices.txt "$RELEASE_PATH"
 
   if [ "$KEEP_MODULES" = 1 ]; then
-    # Copy Node.  Package managers may shim their own "node" wrapper into the
-    # PATH, so run node and ask it for its true path.
-    local node_path
-    node_path="$(node -p process.execPath)"
-    rsync "$node_path" "$RELEASE_PATH/lib/node"
-    chmod 755 "$RELEASE_PATH/lib/node"
-
     # Copy the code-server launcher.
     mkdir -p "$RELEASE_PATH/bin"
     rsync ./ci/build/code-server.sh "$RELEASE_PATH/bin/code-server"
@@ -85,11 +78,15 @@ EOF
   ) > "$RELEASE_PATH/package.json"
   mv npm-shrinkwrap.json "$RELEASE_PATH"
 
-  rsync ci/build/npm-postinstall.sh "$RELEASE_PATH/postinstall.sh"
-
   if [ "$KEEP_MODULES" = 1 ]; then
     rsync node_modules/ "$RELEASE_PATH/node_modules"
+    # Remove dev dependencies.
+    pushd "$RELEASE_PATH"
+    npm prune --production
+    popd
   fi
+
+  rsync ci/build/npm-postinstall.sh "$RELEASE_PATH/postinstall.sh"
 }
 
 bundle_vscode() {
@@ -104,17 +101,23 @@ bundle_vscode() {
   # npm package so exclude any .gitignore files.
   rsync_opts+=(--exclude .gitignore)
 
-  # Exclude Node as we will add it ourselves for the standalone and will not
-  # need it for the npm package.
+  # Exclude Node since we want to place it in a directory above.
   rsync_opts+=(--exclude /node)
 
-  # Exclude Node modules.
+  # Exclude Node modules.  Note that these will already only include production
+  # dependencies, so if we do keep them there is no need to do any
+  # post-processing to remove dev dependencies.
   if [[ $KEEP_MODULES = 0 ]]; then
     rsync_opts+=(--exclude node_modules)
   fi
 
   rsync "${rsync_opts[@]}" "./lib/vscode-reh-web-$VSCODE_TARGET/" "$VSCODE_OUT_PATH"
 
+  # Copy the Node binary.
+  if [[ $KEEP_MODULES = 1 ]]; then
+    cp "./lib/vscode-reh-web-$VSCODE_TARGET/node" "$RELEASE_PATH/lib"
+  fi
+
   # Merge the package.json for the web/remote server so we can include
   # dependencies, since we want to ship this via NPM.
   jq --slurp '.[0] * .[1]' \