Add the SQLITE_TESTCTRL_PRNG_SEED test control.

FossilOrigin-Name: 3ac5723164ae801e209ce525a5d94692767136f9d06be2a84883dcea677d02da

src/sqliteInt.h

@@ -3464,6 +3464,7 @@ struct Sqlite3Config {
   int bInternalFunctions;           /* Internal SQL functions are visible */
   int iOnceResetThreshold;          /* When to reset OP_Once counters */
   u32 szSorterRef;                  /* Min size in bytes to use sorter-refs */
+  unsigned int iPrngSeed;           /* Alternative fixed seed for the PRNG */
 };
 
 /*