stdio: remove unused variables Leftovers from 2007-05-24, commit e461ff7387. * m4/stdio_h.m4 (gl_STDIO_H_DEFAULTS): Remove unused variables. * m4/fseeko.m4 (gl_FUNC_FSEEKO): Likewise. * m4/ftello.m4 (gl_FUNC_FTELLO): Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>