wizkit enhancement

Allow a WIZKIT file name to be specified via the environment.
If none is specified there, get it from the run-time config file.

src/files.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)files.c	3.4	2000/04/27	*/
+/*	SCCS Id: @(#)files.c	3.4	2002/02/23	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -1604,6 +1604,8 @@ fopen_wizkit_file()
 	char *envp;
 #endif
 
+	envp = nh_getenv("WIZKIT");
+	if (envp && *envp) Strcpy(wizkit, envp);
 	if (!wizkit[0]) return (FILE *)0;
 
 #ifdef UNIX