Return an error if localtime_r() fails within one of the date/time functions. Fix for [bd484a090c].

FossilOrigin-Name: 76ae8257efc1df6e20ce5718d4824adbbde423ec
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 83ddb2d..f8735cc 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2452,6 +2452,7 @@
   int nRefInitMutex;                /* Number of users of pInitMutex */
   void (*xLog)(void*,int,const char*); /* Function for logging */
   void *pLogArg;                       /* First argument to xLog() */
+  int bLocaltimeFault;              /* True to fail localtime() calls */
 };
 
 /*