nnrpd/artcle.c XPAT bug fix

[Process Pasteurized Fluffy Product]

I hope this isn't considered to be new functionality. If it has to
wait for 2.4, I'll understand. *whimper*

This restores the ability to use XPAT on non-overview headers.  Other
than adding wildmat it's pretty much just cut-and-paste from the
simliar patch that went in long ago for XHDR.

*** article.c.old	Tue Mar 14 23:10:11 2000
--- article.c	Thu Apr 13 23:35:51 2000
***************
*** 1049,1059 ****
  	    break;
  	}
  
!     if (Overview < 0) {
! 	Reply("%d Header not in index\r\n", NNTP_SYNTAX_VAL);
  	return;
      }
  
      if ((handle = (void *)OVopensearch(GRPcur, range.Low, range.High)) == NULL) {
  	Reply("%d %s fields follow\r\n.\r\n", NNTP_HEAD_FOLLOWS_VAL, av[1]);
  	return;
--- 1049,1076 ----
  	    break;
  	}
  
!     /* Not in overview, we have to fish headers out from the articles */
!     if (Overview < 0 ) {
!         Reply("%d %s matches follow\r\n", NNTP_HEAD_FOLLOWS_VAL, av[1]);
! 	pattern = Glom(&av[3]);
!         for (i = range.Low; i <= range.High && range.High > 0; i++) {
!             if (!ARTopen(i))
!                 continue;
!             p = GetHeader(av[1], FALSE);
! 	    if (p && wildmat(p, pattern)) {
! 		(void)sprintf(buff, "%d ", i);
! 		SendIOb(buff, strlen(buff));
! 		SendIOb(p, strlen(p));
! 		SendIOb("\r\n", 2);
! 		ARTclose();
! 	    }
!         }
!         SendIOb(".\r\n", 3);
!         PushIOb();
  	return;
      }
  
+     /* Okay then, we can grab values from overview. */
      if ((handle = (void *)OVopensearch(GRPcur, range.Low, range.High)) == NULL) {
  	Reply("%d %s fields follow\r\n.\r\n", NNTP_HEAD_FOLLOWS_VAL, av[1]);
  	return;