Update devel/librdkafka to 0.11.3.

Default changes
- Change default queue.buffering.max.kbytes and
  queued.max.message.kbytes to 1GB
- win32: Use sasl.kerberos.service.name for broker principal, not
  sasl.kerberos.principal

Enhancements
- Default producer message offsets to OFFSET_INVALID rather than 0
- new nuget package layout + debian9 librdkafka build
- Allow for calling rd_kafka_queue_io_event_enable() from the C++
  world
- rdkafka_performance: allow testing latency with different size
  messages

Fixes
- Improved stability on termination
- offsets_for_times() return ERR__TIMED_OUT if brokers did not respond
  in time
- Let list_groups() return ERR__PARTIAL with a partial group list
- Properly handle infinite
- Fix offsets_store() return value when at least one valid partition
- portability: rdendian: add le64toh() alias for older glibc
- Add MIPS build and fix CRC32 to work on big endian CPUs
- osx: fix endian checking for software crc32c
- Fix comparison in rd_list_remove_cmp
- stop calling cnd_timedwait() with a timeout of 0h
- Fix DNS cache logic broker.address.ttl
- Fix broker thread "hang" in CONNECT state
- Reset rkb_blocking_max_ms on broker DOWN to avoid busy-loop during
  CONNECT
- Fix memory leak when producev() fails
- Raise cmake minimum version to 3.2
- Do not assume LZ4 worst
- Fix ALL_BROKERS_DOWN re-generation
- rdkafka-performance: busy wait to wait short periods of time


(fhajny)