Attempt to mitigate segmentation faults on help printout by reducing the size of the help string.

src/86box.c

@@ -601,7 +601,9 @@ pc_show_usage(char *s)
             "\n%sUsage: 86box [options] [cfg-file]\n\n"
             "Valid options are:\n\n"
             "-? or --help\t\t\t- show this information\n"
+#ifdef SHOW_EXTRA_PARAMS
             "-C or --config path\t\t- set 'path' to be config file\n"
+#endif
 #ifdef _WIN32
             "-D or --debug\t\t\t- force debug output logging\n"
 #endif
@@ -627,17 +629,23 @@ pc_show_usage(char *s)
 #ifndef USE_SDL_UI
             "-S or --settings\t\t\t- show only the settings dialog\n"
 #endif
+#ifdef SHOW_EXTRA_PARAMS
             "-T or --testmode\t\t- test mode: execute the test mode entry\n"
             "\t\t\t\t   point on init/hard reset\n"
+#endif
             "-V or --vmname name\t\t- overrides the name of the running VM\n"
+#ifdef _WIN32
             "-W or --nohook\t\t- disables keyboard hook\n"
-            "\t\t\t\t   (compatibility-only outside Windows)\n"
+#else
+            "-W or --nohook\t\t- alters keyboard behavior\n"
+#endif
             "-X or --clear what\t\t- clears the 'what' (cmos/flash/both)\n"
+#ifdef SHOW_EXTRA_PARAMS
             "-Y or --donothing\t\t- do not show any UI or run the emulation\n"
-            "-Z or --lastvmpath\t\t- the last parameter is VM path rather\n"
-            "\t\t\t\t  than config\n"
+#endif
+            "-Z or --lastvmpath\t\t- the last parameter is VM path rather than config\n"
             "\nA config file can be specified. If none is, the default file will be used.\n",
-            (s == NULL) ? "" : s);
+            s);
 
 #ifdef _WIN32
     ui_msgbox(MBX_ANSI | ((s == NULL) ? MBX_INFO : MBX_WARNING), p);
@@ -733,7 +741,7 @@ usage:
                 }
             }
 
-            pc_show_usage(NULL);
+            pc_show_usage("");
             return 0;
         } else if (!strcasecmp(argv[c], "--lastvmpath") || !strcasecmp(argv[c], "-Z")) {
             lvmp = 1;