[PodTargetInstaller] Mark all headers with availability levels

lib/cocoapods/installer/target_installer/pod_target_installer.rb

@@ -89,7 +89,6 @@ module Pod
           header_file_refs = headers.map { |sf| project.reference_for_path(sf) }
           native_target.add_file_references(header_file_refs) do |build_file|
             # Set added headers as public if needed
-            if target.requires_frameworks?
             build_file.settings ||= {}
             if public_headers.include?(build_file.file_ref.real_path)
               build_file.settings['ATTRIBUTES'] = ['Public']
@@ -99,7 +98,6 @@ module Pod
               build_file.settings['ATTRIBUTES'] = ['Project']
             end
           end
-          end
 
           other_file_refs = other_source_files.map { |sf| project.reference_for_path(sf) }
           native_target.add_file_references(other_file_refs, nil)

cocoapods-integration-specs @ b5177d3e

-Subproject commit 748ad0dac4f5660eba1d191efa89e0fc8d791b0e
+Subproject commit b5177d3ef2ee0dcc7fdab26f7dcfb9486f2207f1