Always try to build CDC modules

The CDC protocol, authentication and router modules should be build if the
required libraries are found.

cmake/defaults.cmake

@@ -22,7 +22,7 @@ set(BUILD_RABBITMQ TRUE CACHE BOOL "Build RabbitMQ components")
 set(BUILD_BINLOG TRUE CACHE BOOL "Build binlog router")
 
 # Build the Avro router
-set(BUILD_AVRO FALSE CACHE BOOL "Build Avro router")
+set(BUILD_AVRO TRUE CACHE BOOL "Build Avro router")
 
 # Build the multimaster monitor
 set(BUILD_MMMON TRUE CACHE BOOL "Build multimaster monitor")

server/modules/protocol/CMakeLists.txt

@@ -1,4 +1,4 @@
-if(BUILD_CDC)
+if(BUILD_AVRO)
   add_subdirectory(CDC)
   add_subdirectory(examples)
 endif()