less verbose sanity checking

If the 'sanity_check' option triggers a warning, don't show the
"Program in disorder!  (Save and restore might fix this.)" and
"Report these messages to <devteam>." messages and also don't run
the crash report submission.

Doesn't affect the fuzzer because it escalates impossible() to
panic() before reaching those extra messages.

include/extern.h

@@ -428,7 +428,6 @@ extern void end_of_input(void);
 #endif
 extern char readchar(void);
 extern char readchar_poskey(coordxy *, coordxy *, int *);
-extern void sanity_check(void);
 extern char* key2txt(uchar, char *);
 extern char yn_function(const char *, const char *, char, boolean);
 extern char paranoid_ynq(boolean, const char *, boolean);
@@ -3743,6 +3742,7 @@ extern void wizcustom_callback(winid win, int glyphnum, char *id);
 extern int wiz_display_macros(void);
 extern int wiz_mon_diff(void);
 #endif
+extern void sanity_check(void);
 
 /* ### worm.c ### */
 

include/hack.h

@@ -783,6 +783,7 @@ struct sinfo {
     int in_parseoptions;        /* in parseoptions */
     int in_role_selection;      /* role/race/&c selection menus in progress */
     int in_getlin;              /* inside interface getlin routine */
+    int in_sanity_check;        /* for impossible() during sanity checking */
     int config_error_ready;     /* config_error_add is ready, available */
     int beyond_savefile_load;   /* set when past savefile loading */
 #ifdef PANICLOG