not ported to the '386 (xdr_float.c was excluded in the makefile).
Since the '386, like the 68k and sparc, uses IEEE floating point, all
that was needed was to take word ordering into account for
xdr_double().
patch from J.T. Conklin <conklin@talisman.kaleida.com>
hacked to use BYTE_ORDER macros from machine/endian.h