Updating Yoga podspec to support define modules for Swift dependends

Yoga.podspec

@@ -16,6 +16,9 @@ Pod::Spec.new do |spec|
   spec.platforms = { :ios => "8.0", :tvos => "10.0" }
   spec.module_name = 'yoga'
   spec.requires_arc = false
+  spec.pod_target_xcconfig = {
+    'DEFINES_MODULE' => 'YES'
+  }
   spec.compiler_flags = [
       '-fno-omit-frame-pointer',
       '-fexceptions',