Fix return-type of PIO_stdio_flush and export PIO_stdio_istty   and PIO_stdio_getblksize
Fix return-type of PIO_stdio_flush and export PIO_stdio_istty
  and PIO_stdio_getblksize


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@4091 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot