build: SPM temp support changes for support on MacOS

macos/mobile_scanner.podspec

@@ -13,7 +13,7 @@ An universal scanner for Flutter based on MLKit.
   s.license          = { :file => '../LICENSE' }
   s.author           = { 'Julian Steenbakker' => 'juliansteenbakker@outlook.com' }
   s.source           = { :path => '.' }
-  s.source_files     = 'Classes/**/*'
+  s.source_files = 'mobile_scanner/Sources/mobile_scanner/**/*.swift'
   s.dependency 'FlutterMacOS'
   s.platform = :osx, '10.14'
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }

macos/mobile_scanner/Package.swift

@@ -0,0 +1,25 @@
+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "mobile_scanner",
+    platforms: [
+        .macOS("10.14")
+    ],
+    products: [
+        .library(name: "mobile-scanner", targets: ["mobile_scanner"])
+    ],
+    dependencies: [],
+    targets: [
+        .target(
+            name: "mobile_scanner",
+            dependencies: [],
+            resources: [
+                // To add other resources, see the instructions at
+                // https://developer.apple.com/documentation/xcode/bundling-resources-with-a-swift-package
+            ]
+        )
+    ]
+)