Log Message:
devel/librdkafka: Update to 0.11.4.

Default changes

- socket.max.fails changed to 1 to provide same functionality (fail
  request immediately on error) now when retries are working properly
  again.
- fetch.max.bytes (new config property) is automatically adjusted to
  be >= message.max.bytes, and receive.message.max.bytes is
  automatically adjusted to be > fetch.max.bytes.

New features

- Message Headers support
- Java-compatible Murmur2 partitioners
- Add PKCS#12 Keystore support - ssl.keystore.location

Noteworthy fixes

- Formalise and fix Producer retries and retry-ordering
- Ordering is now retained despite retries if max.in.flight=1.
- Behaviour is now documented
- Fix timeouts for retried requests and properly handle retries for
  all request types
- Add and use fetch.max.bytes to limit total Fetch response size.
  Fixes "Invalid response size" issues.

Enhancements

- Added sasl.mechanism and compression.type configuration property
  aliases for conformance with Java client.
- Improved Producer performance
- C++: add c_ptr() to Handle,Topic,Message classes to expose
  underlying librdkafka object
- Honour per-message partition in produce_batch() if MSG_F_PARTITION
  set
- Added on_request_sent() interceptor
- Added experimental flexible producer queuing.strategy=fifo|lifo
- Broker address DNS record round-robin: try to maintain round-robin
  position across resolve calls.
- Set system thread name for internal librdkafka threads
- Added more concise and user-friendly 'consumer' debug context
- Add partitioner (string) topic configuration property to set the
  builtin partitioners
- Generate rdkafka-static.pc (pkg-config) for static linking

Fixes

- Fix producer memory leak on <0.11 brokers when compressed messageset
  is below copy threshold
- CRC32C - fix unaligned access on ARM
- Fix read after free in buf_write_seek
- Fix broker wake up
- Fix consumer hang when rebalancing during commit
- CMake fixes for Windows
- LeaveGroup was not sent on close when doing final offset commits
- Fix for consumer slowdown/stall on compacted topics where actual
  last offset < MsgSet.LastOffset
- Fix global->topic conf fallthru in C++ API
- Fix infinite loop on LeaveGroup failure
- Fix possible crash on OffsetFetch retry
- Incorporate compressed message count when deciding on fetch backoff
- Fix debug-only crash on Solaris (%s NULL)
- Drain broker ops queue on termination to avoid hang
- cmake: Allow build static library
- Don't store invalid offset as next one when pausing
- use #if instead of #ifdef / defined() for atomics
- fixed .lib paths in nuget packaging
- Fixes strerror_r crash on alpine
- Allow arbitrary lengthed (>255) SASL PLAIN user/pass
- Trigger ApiVersionRequest on reconnect if broker.version.fallback
  supports it
- Read Fetch MsgAttributes as int8
- Portability: stop using typeof in rdkafka_transport.c
- Portability: replace use of #pragma once with header guards
- mklove: add LIBS in reverse order to maintain dependency order
- Fix build when python is not available #1358