[FileReferencesInstaller] Dont create build headers for frameworks

lib/cocoapods/installer/file_references_installer.rb

@@ -117,21 +117,19 @@ module Pod
             pod_target.file_accessors.each do |file_accessor|
               framework_exp = /\.framework\//
               headers_sandbox = Pathname.new(file_accessor.spec.root.name)
-              pod_target.build_headers.add_search_path(headers_sandbox, pod_target.platform)
 
               # When integrating Pod as frameworks, built Pods are built into
               # frameworks, whose headers are included inside the built
               # framework. Those headers do not need to be linked from the
               # sandbox.
               unless pod_target.requires_frameworks? && pod_target.should_build?
+                pod_target.build_headers.add_search_path(headers_sandbox, pod_target.platform)
                 sandbox.public_headers.add_search_path(headers_sandbox, pod_target.platform)
-              end
 
-              header_mappings(headers_sandbox, file_accessor, file_accessor.headers).each do |namespaced_path, files|
-                pod_target.build_headers.add_files(namespaced_path, files.reject { |f| f.to_path =~ framework_exp })
-              end
+                header_mappings(headers_sandbox, file_accessor, file_accessor.headers).each do |namespaced_path, files|
+                  pod_target.build_headers.add_files(namespaced_path, files.reject { |f| f.to_path =~ framework_exp })
+                end
 
-              unless pod_target.requires_frameworks? && pod_target.should_build?
                 header_mappings(headers_sandbox, file_accessor, file_accessor.public_headers).each do |namespaced_path, files|
                   sandbox.public_headers.add_files(namespaced_path, files.reject { |f| f.to_path =~ framework_exp })
                 end