We now close the write end of the pipe that serves as stdin for the apps
we run. This means that any read attempts will return EOD (read() returns 0)
which should hopefully tell our apps that we don't have stdin for them.
Sadly vim doesn't care... (Only thing I tested that still broke)
git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1136 726aef4b-f618-498e-8847-2d620e286838