Fix:	SE036

Problem:
	Fails during game startup complaining that it is unable to find the
	dungeon file. This is because the file area support code was lost
	from dlb.h in the merge with the 3.3 codebase.

Compatible with:
	Slash'EM 0.0.5E9 (DOS only)

Author: J. Ali Harlow, ali@avrc.city.ac.uk

Date:	10 Jan 2000

*** include/dlb.h.orig	Mon Jan 10 13:26:57 2000
--- include/dlb.h	Mon Jan 10 13:28:53 2000
***************
*** 37,43 ****
  
  /* library definitions */
  # ifndef DLBFILE
! #  define DLBFILE	"nhdat"			/* name of library */
  # endif
  # ifndef FILENAME_CMP
  #  define FILENAME_CMP	strcmp			/* case sensitive */
--- 37,46 ----
  
  /* library definitions */
  # ifndef DLBFILE
! #  define DLBFILE	"nhshare"		/* shareable library */
! #  define DLBAREA	FILE_AREA_SHARE
! #  define DLBFILE2	"nhunshare"		/* unshareable library */
! #  define DLBAREA2	FILE_AREA_UNSHARE
  # endif
  # ifndef FILENAME_CMP
  #  define FILENAME_CMP	strcmp			/* case sensitive */
***************
*** 71,77 ****
--- 74,84 ----
  boolean NDECL(dlb_init);
  void NDECL(dlb_cleanup);
  
+ #ifndef FILE_AREAS
  dlb *FDECL(dlb_fopen, (const char *,const char *));
+ #else
+ dlb *FDECL(dlb_fopen_area, (const char *,const char *,const char *));
+ #endif
  int FDECL(dlb_fclose, (DLB_P));
  int FDECL(dlb_fread, (char *,int,int,DLB_P));
  int FDECL(dlb_fseek, (DLB_P,long,int));
***************
*** 101,107 ****
--- 108,118 ----
  # define dlb_init()
  # define dlb_cleanup()
  
+ #ifndef FILE_AREAS
  # define dlb_fopen	fopen
+ #else
+ # define dlb_fopen_area fopen_datafile_area
+ #endif
  # define dlb_fclose	fclose
  # define dlb_fread	fread
  # define dlb_fseek	fseek