Removed recursive linking incompatible with xcode 11.4

Author: Jan Weber

Package.swift

@@ -1,5 +1,11 @@
 import PackageDescription
 
 let package = Package(
-    name: "ObjectMapper"
+    name: "ObjectMapper",
+    targets: [
+        .target(
+            name: "ObjectMapper", 
+            path: "Sources"
+        )
+    ],
 )

Package@swift-4.2.swift

@@ -11,7 +11,7 @@ let package = Package(
     targets: [
         .target(
             name: "ObjectMapper", 
-            dependencies: []
+            path: "Sources"
         )
     ],
     swiftLanguageVersions: [.v3, .v4, .v4_2]

Package@swift-4.swift

@@ -11,7 +11,7 @@ let package = Package(
     targets: [
         .target(
             name: "ObjectMapper", 
-            dependencies: []
+            path: "Sources"
         )
     ],
     swiftLanguageVersions = [3, 4]