[PATCH v7 0/2 hurd] Add irqhelp and clean up ddekit

[Damien Zammit]

Hi,

I figured out that a semaphore is needed in ddekit to wait until
the thread_init(priv) is called.  This was initially confusing
because I thought a semaphore was needed in the irqhelp library, but
it is not required there.

TESTED: copying a large file from hurd to linux and ifup/ifdown 
a few times with 100% success using a recompiled netdde.static

Damien