Don't complain about MAXPLAYERS with unknown command line param

Unix command line handling treated an unknown command line parameter
as a maximum number of allowed concurrent players.  This emitted
a complaint about expected MAXPLAYERS, and as it can be now set
in sysconf, remove this - most likely unused - functionality.

doc/fixes5-0-1.txt

@@ -260,6 +260,7 @@ X11: toggle off perm_invent if user closes the perm inventory window
 X11: fix menu group accelerators
 X11: implement all text attributes for menus
 X11: fix crash when loading a nonexistent font
+Unix: don't complain about MAXPLAYERS with unknown command line param
 
 
 General New Features

sys/unix/unixmain.c

@@ -454,22 +454,8 @@ process_options(int argc, char *argv[])
         }
     }
 
-    if (argc > 1) {
+    if (argc > 1)
-        int mxplyrs = atoi(argv[1]);
+        config_error_add("Unknown option: %.60s", origarg);
-        boolean mx_ok = (mxplyrs > 0);
-#ifdef SYSCF
-        config_error_add("%s%s%s",
-                         mx_ok ? "MAXPLAYERS are set in sysconf file"
-                               : "Expected MAXPLAYERS, found \"",
-                         mx_ok ? "" : argv[1], mx_ok ? "" : "\"");
-#else
-        /* XXX This is deprecated in favor of SYSCF with MAXPLAYERS */
-        if (mx_ok)
-            gl.locknum = mxplyrs;
-        else
-            config_error_add("Invalid MAXPLAYERS \"%s\"", argv[1]);
-#endif
-    }
 #ifdef MAX_NR_OF_PLAYERS
     /* limit to compile-time limit */
     if (!gl.locknum || gl.locknum > MAX_NR_OF_PLAYERS)