clib2 Code

function pointers alone. The utility.library/CallHookPkt mechanism
is no longer required.

- Moved the entire lseek() code relevant for files into the hook
function.

- Simplified the close() function which now just calls into the
hook code to perform whatever is necessary. The hook code is
responsible for cleaning up after aliases, etc. This change in
turn made it possible to greatly simplify the hook code for
buffered files which now bypasses close/read/write/lseek and
directly invokes the hook code for unbuffered files.