xdrgen: Add generator code for XDR width macros

Introduce logic in the code generators to emit maxsize (XDR
width) definitions. In C, these are pre-processor macros.

Signed-off-by: Chuck Lever <chu

xdrgen: Add generator code for XDR width macros

Introduce logic in the code generators to emit maxsize (XDR
width) definitions. In C, these are pre-processor macros.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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