tag -v: use RUN_GIT_CMD to run verify-tag

This is the preferred way to run a git command.

The only obvious observable effects I can think of are that the exec
is properly reported in GIT_TRACE output and that verifying signed
tags will still work if the git-verify-tag hard link in gitexecdir
goes missing.

Helped-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/tag.c

@@ -147,11 +147,11 @@ static int delete_tag(const char *name, const char *ref,
 static int verify_tag(const char *name, const char *ref,
 				const unsigned char *sha1)
 {
-	const char *argv_verify_tag[] = {"git-verify-tag",
+	const char *argv_verify_tag[] = {"verify-tag",
 					"-v", "SHA1_HEX", NULL};
 	argv_verify_tag[2] = sha1_to_hex(sha1);
 
-	if (run_command_v_opt(argv_verify_tag, 0))
+	if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 		return error("could not verify the tag '%s'", name);
 	return 0;
 }