out_kafka/librdkafka: upgrade from 1.4.2 to 1.5.0 and enable zstd

librdkafka 1.4.2 has trouble building with zstd support, so we bump
the library's version to 1.5.0.

We also install libzstd-dev in Dockerfile so that the image will build
with zstd support.

Signed-off-by: Krzysztof Piecuch <[email protected]>

Author: Krzysztof Piecuch

Dockerfile

@@ -20,6 +20,7 @@ RUN apt-get update && \
     libsasl2-dev \
     pkg-config \
     libsystemd-dev \
+    libzstd-dev \
     zlib1g-dev \
     libpq-dev \
     postgresql-server-dev-all \

plugins/out_kafka/CMakeLists.txt

@@ -4,10 +4,10 @@ FLB_OPTION(RDKAFKA_BUILD_EXAMPLES Off)
 FLB_OPTION(RDKAFKA_BUILD_TESTS    Off)
 FLB_OPTION(ENABLE_LZ4_EXT         Off)
 
-add_subdirectory(librdkafka-1.4.2 EXCLUDE_FROM_ALL)
+add_subdirectory(librdkafka-1.5.0 EXCLUDE_FROM_ALL)
 
 # librdkafka headers
-include_directories(librdkafka-1.4.2/src/)
+include_directories(librdkafka-1.5.0/src/)
 
 # Fluent Bit Kafka Output plugin
 set(src