Only apply standard swift settings on valid targets (#1186)

Co-authored-by: Si Beaumont <simonjbeaumont@gmail.com>

Author: rnro

Package.swift

@@ -280,11 +280,16 @@ var package = Package(
 
 // --- STANDARD CROSS-REPO SETTINGS DO NOT EDIT --- //
 for target in package.targets {
- if target.type != .plugin {
+ switch target.type {
+ case .regular, .test, .executable:
  var settings = target.swiftSettings ?? []
  // https://github.com/swiftlang/swift-evolution/blob/main/proposals/0444-member-import-visibility.md
  settings.append(.enableUpcomingFeature("MemberImportVisibility"))
  target.swiftSettings = settings
+ case .macro, .plugin, .system, .binary:
+ () // not applicable
+ @unknown default:
+ () // we don't know what to do here, do nothing
  }
 }
 // --- END: STANDARD CROSS-REPO SETTINGS DO NOT EDIT --- //