types. add xdr_{,u_}int{16,32}_t() functions to convert them.
This is necessary, because things like BPF use the RPC headers to look
at the on-the-wire data, so the headers must accurately represent
what's on the wire, too.
conklin@talisman.kaleida.com
* use consistant macro names for multiple #include protection
of header files. I used the same convention used by TIRPC.
* added function prototypes to header files.
* fixed C source where it conflicted with prototypes, documentation,
and TIRPC.
