Still not usefull only 4/6 predefined Sudokus will bee solved

Running on 1.7GHz Dual core 64bit AMD 4GB ram. HP pavillon dv7

no 0.	240uSec.
no 1.	411-450uSec
no 2.   64uSec
no 3.   300uSec

no 4-5 Cannot solve these. If we compare to github:coolsen/Sudoku_js
it will take from 1000uSec to 17000uSec. But the all will get get
solved within that time.

	modified:   Sudoku_c.c