Remove a remaining stray reference to PACKAGE_DESCRIPTION_4.  Since the condition was `#if !PACKAGE_DESCRIPTION_4`, there is actually no semantic difference. (#3549)
Remove a remaining stray reference to PACKAGE_DESCRIPTION_4.  Since the condition was `#if !PACKAGE_DESCRIPTION_4`, there is actually no semantic difference. (#3549)


apple/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager