Unusual CPP idiom used in some libio files

[Jeffrey A Law]

  In message < 9810169085.AA908524021@cc.pmsc.com >you write:
  > 
  > Some of the libio files use an unusual, though ANSI, CPP idiom,
  > should they?
libio will only ever be compiled by gcc, so using ANSI stuff is OK.

jeff