[hurd,commited]: Fix static initialization with -fstack-protector-strong

[Samuel Thibault]

Nick Alcock, on ven. 15 sept. 2017 17:38:38 +0100, wrote:
> On 27 Aug 2017, Samuel Thibault outgrape:
> >     When linked statically, TLS initialization is not achieved before
> >     mach_init and alike, so ssp accesses to tcbhead's stack_guard would
> >     crash.  We can just avoid using ssp in the few functions needed before
> >     TLS is set up.
> 
> Oh blast I forgot all about Hurd didn't I.
> 
> Sorry.

No problem. Determining which functions need it is not trivial anyway :)

Samuel