This allows to break commands such as:
C:\ReactOS\system32> for %f in (*.*) do dir
as one would expect: stop the currently running 'dir' and the 'for'.
"bCtrlBreak" doesn't need to be volatile too.
Using CTRL-C to cancel command line input would leave the prompt in
a state where the next command would be ignored. For example:
dir<CTRL-C>
dir
would cause cmd.exe to ignore the second dir command.