Fix translation domain in pg_basebackup

For some reason, we've been overlooking the fact that pg_receivexlog
and pg_recvlogical are using wrong translation domains all along,
so their output hasn't ever been translated.  The right domain is
pg_basebackup, not their own executable names.

Noticed by Ioseph Kim, who's been working on the Korean translation.

Backpatch pg_receivexlog to 9.2 and pg_recvlogical to 9.4.

src/bin/pg_basebackup/pg_receivexlog.c

@@ -383,7 +383,7 @@ main(int argc, char **argv)
 	char	   *db_name;
 
 	progname = get_progname(argv[0]);
-	set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_receivexlog"));
+	set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_basebackup"));
 
 	if (argc > 1)
 	{

src/bin/pg_basebackup/pg_recvlogical.c

@@ -645,7 +645,7 @@ main(int argc, char **argv)
 	char	   *db_name;
 
 	progname = get_progname(argv[0]);
-	set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_recvlogical"));
+	set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_basebackup"));
 
 	if (argc > 1)
 	{