archive-*.c: use designated initializers for "struct archiver"

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

archive-tar.c

@@ -461,9 +461,9 @@ static int write_tar_filter_archive(const struct archiver *ar,
 }
 
 static struct archiver tar_archiver = {
-	"tar",
-	write_tar_archive,
-	ARCHIVER_REMOTE
+	.name = "tar",
+	.write_archive = write_tar_archive,
+	.flags = ARCHIVER_REMOTE,
 };
 
 void init_tar_archiver(void)

archive-zip.c

@@ -637,9 +637,9 @@ static int write_zip_archive(const struct archiver *ar,
 }
 
 static struct archiver zip_archiver = {
-	"zip",
-	write_zip_archive,
-	ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
+	.name = "zip",
+	.write_archive = write_zip_archive,
+	.flags = ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE,
 };
 
 void init_zip_archiver(void)