Don't link binaries of build framework pods to the user target

In case of generated pod targets, which require frameworks, the vendored frameworks and libraries are already linked statically into the framework binary and must not be linked again to the user target.

lib/cocoapods/generator/xcconfig/aggregate_xcconfig.rb

@@ -82,7 +82,13 @@ module Pod
           XCConfigHelper.add_target_specific_settings(target, @xcconfig)
 
           pod_targets.each do |pod_target|
-            XCConfigHelper.add_settings_for_file_accessors_of_target(pod_target, @xcconfig)
+            unless pod_target.should_build? && pod_target.requires_frameworks?
+              # In case of generated pod targets, which require frameworks, the
+              # vendored frameworks and libraries are already linked statically
+              # into the framework binary and must not be linked again to the
+              # user target.
+              XCConfigHelper.add_settings_for_file_accessors_of_target(pod_target, @xcconfig)
+            end
 
             # Add pod target to list of frameworks / libraries that are
             # linked with the user’s project.