Update from 1.19.4 to 1.19.5.

<Changelog>

*) Feature: the -e switch.

*) Feature: the same source files can now be specified in different

modules while building addon modules.

*) Bugfix: SSL shutdown did not work when lingering close was used.

*) Bugfix: "upstream sent frame for closed stream" errors might occur

when working with gRPC backends.

*) Bugfix: in request body filters internal API.

</Changelog>