special parameter fix

[Zefram <zefram@xxxxxxxxxxxxxxxxx>]

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My patch 3048 contained a small bug, in that its method of checking for
an attempt to change the type of a special parameter is ineffective.
The commands

typeset -R UID
echo $UID

will cause a crash without this patch.

 -zefram

 *** Src/builtin.c	1997/03/30 00:49:13	1.74
 --- Src/builtin.c	1997/03/31 04:01:22
 ***************
 *** 1415,1421 ****
   		continue;
   	    }
   	    if((pm->flags & PM_SPECIAL) &&
 ! 	       PM_TYPE(on) && PM_TYPE(on) != PM_TYPE(pm->flags)) {
   		zerrnam(name, "%s: cannot change type of a special parameter",
   		    pm->nam, 0);
   		returnval = 1;
 --- 1415,1421 ----
   		continue;
   	    }
   	    if((pm->flags & PM_SPECIAL) &&
 ! 	       PM_TYPE((pm->flags | on) & ~off) != PM_TYPE(pm->flags)) {
   		zerrnam(name, "%s: cannot change type of a special parameter",
   		    pm->nam, 0);
   		returnval = 1;

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