* include/rpc/auth.h: Use libc_hidden_proto for getnetname,

* include/rpc/auth.h: Use libc_hidden_proto for getnetname,

	netname2user, host2netname, user2netname, key_gendes.
	* sunrpc/netname.c: Add libc_hidden_def.
	* sunrpc/key_call.c: Likewise.

	* include/netdb.h: Use libc_hidden_proto for getaddrinfo, getnameinfo,
	freeaddrinfo.
	* inet/getnameinfo.c: Add libc_hidden_def.
	* sysdeps/generic/getaddrinfo.c: Likewise.
	* sysdeps/posix/getaddrinfo.c: Likewise.

	* include/wchar.h: Use libc_hidden_proto for wmemchr, wmemset.
	* wcsmbs/wmemchr.c: Add libc_hidden_def.
	* wcsmbs/wmemset.c: Add libc_hidden_def.

	* include/string.h: Move libc_hidden_proto's inside #ifndef _STRING_H.
	(index, rindex): Define as macros for strchr, strrchr.

	* string/envz.c (envz_strip): index -> strchr

	* include/rpc/rpc_msg.h: Use libc_hidden_proto for _seterr_reply.
	* sunrpc/rpc_prot.c: Add libc_hidden_def.

	* include/wchar.h: Use libc_hidden_proto for mbrtowc.
	* wcsmbs/mbrtowc.c: Add libc_hidden_weak.