Makefile: Move plugins list to `plugins.mk`

[#131643765]

Makefile

@@ -13,31 +13,7 @@ PACKAGES_DIR ?= $(abspath PACKAGES)
 DEPS = rabbit_common rabbit $(PLUGINS)
 
 # List of plugins to include in a RabbitMQ release.
-PLUGINS := rabbitmq_amqp1_0 \
-	   rabbitmq_auth_backend_ldap \
-	   rabbitmq_auth_mechanism_ssl \
-	   rabbitmq_consistent_hash_exchange \
-	   rabbitmq_event_exchange \
-	   rabbitmq_federation \
-	   rabbitmq_federation_management \
-	   rabbitmq_jms_topic_exchange \
-	   rabbitmq_management \
-	   rabbitmq_management_agent \
-	   rabbitmq_management_visualiser \
-	   rabbitmq_mqtt \
-	   rabbitmq_recent_history_exchange \
-	   rabbitmq_sharding \
-	   rabbitmq_shovel \
-	   rabbitmq_shovel_management \
-	   rabbitmq_stomp \
-	   rabbitmq_top \
-	   rabbitmq_tracing \
-	   rabbitmq_trust_store \
-	   rabbitmq_web_dispatch \
-	   rabbitmq_web_stomp \
-	   rabbitmq_web_stomp_examples \
-	   rabbitmq_web_mqtt \
-	   rabbitmq_web_mqtt_examples
+include plugins.mk
 
 DEP_PLUGINS = rabbit_common/mk/rabbitmq-run.mk \
 	      rabbit_common/mk/rabbitmq-dist.mk \

plugins.mk

@@ -0,0 +1,25 @@
+PLUGINS := rabbitmq_amqp1_0 \
+	   rabbitmq_auth_backend_ldap \
+	   rabbitmq_auth_mechanism_ssl \
+	   rabbitmq_consistent_hash_exchange \
+	   rabbitmq_event_exchange \
+	   rabbitmq_federation \
+	   rabbitmq_federation_management \
+	   rabbitmq_jms_topic_exchange \
+	   rabbitmq_management \
+	   rabbitmq_management_agent \
+	   rabbitmq_management_visualiser \
+	   rabbitmq_mqtt \
+	   rabbitmq_recent_history_exchange \
+	   rabbitmq_sharding \
+	   rabbitmq_shovel \
+	   rabbitmq_shovel_management \
+	   rabbitmq_stomp \
+	   rabbitmq_top \
+	   rabbitmq_tracing \
+	   rabbitmq_trust_store \
+	   rabbitmq_web_dispatch \
+	   rabbitmq_web_stomp \
+	   rabbitmq_web_stomp_examples \
+	   rabbitmq_web_mqtt \
+	   rabbitmq_web_mqtt_examples