[patch] xdr is missing includes

[Ralf Corsepius]

Hi,

libc/xdr doesn't compile for rtems.

The cause apparently is missing includes:
- libc/xdr/xdr_private.h applies uint32_t
   but doesn't include <stdint.h>

- libc/xdr/xdr_rec.c applies INT_MAX and LONG_MAX
   but doesn't include <limits.h>

Patch enclosed below.

Ralf
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