subr.el (21.5.31) for 21.5.29

[Stephen J. Turnbull]

Uwe Brauer writes:
 > Hello
 > 
 > I tried to byte compile subr.el from 21.5.31 and I obtain 
 > 
 >  the function special-operator-p is not known to be defined.
 > 
 > Is this a new build in function?

Yes.  It's basically the same as the old special-form-p.

(defalias 'special-operator-p 'special-form-p)

should do the trick.