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use NULL setpagesize segop as a shorthand for ENOTSUP
Instead of forcing every segment driver to implement a dummp function to
return (hopefully) ENOTSUP, handle NULL setpagesize segop function pointer
as "return ENOTSUP" shorthand.
*** 127,137 ****
          .getprot        = nop,
          .getoffset      = nop,
          .gettype        = nop,
          .getvp          = nop,
          .advise         = nop,
-         .setpagesize    = nop,
          .getpolicy      = nop,
  #endif
  };
  
  /*
--- 127,136 ----