Change standard value of `ndsrd-process-coding-system' 

Default charset of  ```csrd``` is different between Unix and Windows. It is EUC-JP on Unix and SHIFT_JIS on Windows.
But on Unix  ```lookup-process-coding-system``` is initialized to ```'utf-8``` unless explicitly specified.
It cause ```ndsrd-process-cofing-system``` to be set to same value, and results in charset mismatch on Unix.
Therefore standard value of  ```ndsrd-process-coding-system``` is changed  so that simply ```'euc-jp```  is assigned on Unix and ```'cp932``` on Windows.