bundle: define subcommand -h in terms of command -h

Avoid repeating the "-h" output for the "git bundle" command, and
instead define the usage of each subcommand with macros, so that the
"-h" output for the command itself can re-use those definitions. See
[1], [2] and [3] for prior art using the same pattern.

1. b25b727494 (builtin/multi-pack-index.c: define common usage with a
   macro, 2021-03-30)
2. 8757b35d44 (commit-graph: define common usage with a macro,
   2021-08-23)
3. 1e91d3faf6 (reflog: move "usage" variables and use macros,
   2022-03-17)

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/bundle.c

@@ -11,31 +11,40 @@
  * bundle supporting "fetch", "pull", and "ls-remote".
  */
 
-static const char * const builtin_bundle_usage[] = {
-	N_("git bundle create [<options>] <file> <git-rev-list args>"),
-	N_("git bundle verify [<options>] <file>"),
-	N_("git bundle list-heads <file> [<refname>...]"),
-	N_("git bundle unbundle <file> [<refname>...]"),
-	NULL
+#define BUILTIN_BUNDLE_CREATE_USAGE \
+	N_("git bundle create [<options>] <file> <git-rev-list args>")
+#define BUILTIN_BUNDLE_VERIFY_USAGE \
+	N_("git bundle verify [<options>] <file>")
+#define BUILTIN_BUNDLE_LIST_HEADS_USAGE \
+	N_("git bundle list-heads <file> [<refname>...]")
+#define BUILTIN_BUNDLE_UNBUNDLE_USAGE \
+	N_("git bundle unbundle <file> [<refname>...]")
+
+static char const * const builtin_bundle_usage[] = {
+	BUILTIN_BUNDLE_CREATE_USAGE,
+	BUILTIN_BUNDLE_VERIFY_USAGE,
+	BUILTIN_BUNDLE_LIST_HEADS_USAGE,
+	BUILTIN_BUNDLE_UNBUNDLE_USAGE,
+	NULL,
 };
 
 static const char * const builtin_bundle_create_usage[] = {
-	N_("git bundle create [<options>] <file> <git-rev-list args>"),
+	BUILTIN_BUNDLE_CREATE_USAGE,
 	NULL
 };
 
 static const char * const builtin_bundle_verify_usage[] = {
-	N_("git bundle verify [<options>] <file>"),
+	BUILTIN_BUNDLE_VERIFY_USAGE,
 	NULL
 };
 
 static const char * const builtin_bundle_list_heads_usage[] = {
-	N_("git bundle list-heads <file> [<refname>...]"),
+	BUILTIN_BUNDLE_LIST_HEADS_USAGE,
 	NULL
 };
 
 static const char * const builtin_bundle_unbundle_usage[] = {
-	N_("git bundle unbundle <file> [<refname>...]"),
+	BUILTIN_BUNDLE_UNBUNDLE_USAGE,
 	NULL
 };