IO serial general.

The delay loop is only needed until first byte is received.
How it was just caused an eternal loop until sci driver issued an error or blocked for a certain amount off time depending on the way the driver handled it.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@10043 4b0bc96b-bc66-0410-9d44-ebda105a78c1