fix github issue #200 - docs for 'strange object'

Fixes #200

The Guidebook claims that there's no symbol for 'S_strange_object'
which is literally true, but there is one for S_strange_obj.  It has
been in place longer than the paragraph claiming that there's no way
to customize that symbol.  I'm not sure why variant spelling was used.

Also, files.c doesn't use loadsyms[], it calls a routine which returns
a pointer to a specific element in that array.

doc/Guidebook.mn

@@ -1,4 +1,4 @@
-.\" $NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.310 $ $NHDT-Date: 1562114349 2019/07/03 00:39:09 $
+.\" $NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.311 $ $NHDT-Date: 1562719337 2019/07/10 00:42:17 $
 .\"
 .\" This is an excerpt from the 'roff' man page from the 'groff' package.
 .\" NetHack's Guidebook.mn currently does *not* adhere to these guidelines.
@@ -24,7 +24,7 @@
 .ds vr "NetHack 3.6
 .ds f0 "\*(vr
 .ds f1
-.ds f2 "May 7, 2019
+.ds f2 "July 9, 2019
 .
 .\" A note on some special characters:
 .\" \(lq = left double quote
@@ -4555,14 +4555,6 @@ z	S_zruty	(zruty)
 .\"TABLE_END  Do not delete this line.
 .TE
 .pg
-There is one additional class of object, described as \(lqstrange object\(rq,
-which will occasionally be the shape taken on by mimics and shown
-as \(oq]\(cq for maps displayed as text characters.
-Although the displayed character is the same as the default value for
-\(lqS_mimic_def\(rq, it is a different symbol and there is no corresponding
-\(lqS_strange_object\(rq symbol nor any way to assign an alternate value
-for it.
-.pg
 .hn 2
 Configuring NetHack for Play by the Blind
 .pg

doc/Guidebook.tex

@@ -45,7 +45,7 @@
 %.au
 \author{Original version - Eric S. Raymond\\
 (Edited and expanded for 3.6 by Mike Stephenson and others)}
-\date{May 7, 2019}
+\date{July 9, 2019}
 
 \maketitle
 
@@ -5048,17 +5048,6 @@ Default                      & Symbol Name                & Description\\
 \end{longtable}%
 }
 
-%.pg
-There is one additional class of object, described as ``strange object'',
-which will occasionally be the shape taken on by mimics and shown as
-`{\tt \verb+]+}'
-for maps displayed as text characters.
-Although the displayed character is the same as the default value for
-`S\verb+_+mimic\verb+_+def', it is a different symbol and there is no
-corresponding
-`S\verb+_+strange\verb+_+object' symbol nor any way to assign an
-alternate value for it.
-
 %.pg
 %.hn 2
 \subsection*{Configuring {\it NetHack\/} for Play by the Blind}

src/files.c

@@ -1,4 +1,4 @@
-/* NetHack 3.6	files.c	$NHDT-Date: 1559670605 2019/06/04 17:50:05 $  $NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.250 $ */
+/* NetHack 3.6	files.c	$NHDT-Date: 1562719337 2019/07/10 00:42:17 $  $NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.252 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Derek S. Ray, 2015. */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -3140,7 +3140,6 @@ boolean FDECL((*proc), (char *));
 }
 
 extern struct symsetentry *symset_list;  /* options.c */
-extern struct symparse loadsyms[];       /* drawing.c */
 extern const char *known_handling[];     /* drawing.c */
 extern const char *known_restrictions[]; /* drawing.c */
 static int symset_count = 0;             /* for pick-list building only */
@@ -3213,7 +3212,7 @@ char *buf;
 int which_set;
 {
     int val, i;
-    struct symparse *symp = (struct symparse *) 0;
+    struct symparse *symp;
     char *bufp, *commentp, *altp;
 
     /* convert each instance of whitespace (tabs, consecutive spaces)