[Libguestfs] 2 patches to make portablexdr useable in mingw

[Richard W.M. Jones]

I'm not sure what to do with these patches, since it looks as if these
won't apply to the unreleased portablexdr 4.9.2.

This library is obsolete, since the original SunRPC code was
relicensed and can now be used directly by any project that needs it.
It's unfortunate there is no XDR code for mingw except for
PortableXDR ...

Rich.

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