Reinstate dep_name as it's still used by RabbitMQ plugins

It will be removed at a later date.

CHANGELOG.asciidoc

@@ -34,9 +34,13 @@
             as well as Cowboy, Ranch, Gun and Cowlib remain
             in the index.
 
-2024/11/19: The deprecated defines `dep_fetch`, `dep_name`,
+2024/11/19: The deprecated defines `dep_fetch`,
             `dep_repo` and `dep_commit` have been removed
             in favor of their `query_*` equivalents.
++
+            The deprecated define `dep_name` will be
+            removed at a later date to give time to
+            users to upgrade.
 +
             The deprecated legacy fetch method has also
             been removed (`dep_cowboy = https://... ref`

core/deps.mk

@@ -111,6 +111,10 @@ query_extra_fail = -
 
 query_absolute_path = $(addprefix $(DEPS_DIR)/,$(call query_name,$1))
 
+# Deprecated legacy query function. Used by RabbitMQ and its third party plugins.
+# Can be removed once RabbitMQ has been updated and enough time has passed.
+dep_name = $(call query_name,$(1))
+
 # Application directories.
 
 LOCAL_DEPS_DIRS = $(foreach a,$(LOCAL_DEPS),$(if $(wildcard $(APPS_DIR)/$a),$(APPS_DIR)/$a))