Merge branch 'ab/unused-annotation'

Undoes 'jk/unused-annotation' topic and redoes it to work around
Coccinelle rules misfiring false positives in unrelated codepaths.

* ab/unused-annotation:
  git-compat-util.h: use "deprecated" for UNUSED variables
  git-compat-util.h: use "UNUSED", not "UNUSED(var)"

builtin/submodule--helper.c

@@ -573,9 +573,9 @@ static void print_status(unsigned int flags, char state, const char *path,
 	printf("\n");
 }
 
-static int handle_submodule_head_ref(const char *UNUSED(refname),
+static int handle_submodule_head_ref(const char *refname UNUSED,
 				     const struct object_id *oid,
-				     int UNUSED(flags),
+				     int flags UNUSED,
 				     void *cb_data)
 {
 	struct object_id *output = cb_data;