Add ErrorObject and SwiftObject to all builds

These files are required in order to link libswiftCore regardless of
whether ObjectiveC is required.

Author: etcwilde

Runtimes/Core/runtime/CMakeLists.txt

@@ -108,10 +108,12 @@ if(SwiftCore_ENABLE_BACKTRACING)
     CrashHandlerLinux.cpp)
 endif()
 
+target_sources(swiftRuntime PRIVATE
+  ErrorObject.mm
+  SwiftObject.mm)
+
 if(SwiftCore_ENABLE_OBJC_INTEROP)
   target_sources(swiftRuntime PRIVATE
-    ErrorObject.mm
-    SwiftObject.mm
     SwiftValue.mm
     ReflectionMirrorObjC.mm
     ObjCRuntimeGetImageNameFromClass.mm)