Move 'rpc' routines from 'inet' into 'nss'

The getrpcby* and getrpcent* routines are entry points for nss
functionality.  This commit moves them from the 'inet' subdirectory to
'nss'.  The Versions entries for these routines along with a test,
located in the 'sunrpc' subdirectory, are also moved into 'nss'.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

nss/getrpcent.c

@@ -0,0 +1,28 @@
+/* Copyright (C) 1996-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <rpc/netdb.h>
+
+
+#define LOOKUP_TYPE	struct rpcent
+#define	GETFUNC_NAME	getrpcent
+#define BUFLEN		1024
+
+/* There is no nscd support for the rpc file.  */
+#undef	USE_NSCD
+
+#include "../nss/getXXent.c"