[embedded] Add missing option to expected_options.py

Author: kubamracek

utils/build_swift/tests/expected_options.py

@@ -598,6 +598,7 @@ class BuildScriptImplOption(_BaseOption):
     EnableOption('--build-toolchain-only'),
     EnableOption('--build-swift-private-stdlib'),
     EnableOption('--build-swift-stdlib-unicode-data'),
+    EnableOption('--build-embedded-stdlib'),
     EnableOption('--build-embedded-stdlib-cross-compiling'),
     EnableOption('--build-swift-libexec'),
     EnableOption('--build-swift-clang-overlays'),