[PATCH] hurd: Fix linknamespace of spawni

[Florian Weimer]

* Samuel Thibault:

> 	* include/unistd.h (__confstr): Add prototype and hidden prototype.
> 	* posix/confstr.c (confstr): Rename to __confstr.
> 	(__confstr): Add hidden def.
> 	(confstr): Add weak alias for __confstr.
> 	* sysdeps/mach/hurd/spawni.c (__spawni): Call __confstr instead of
> 	confstr.

Looks reasonable to me, and it should fix the linknamespace failure.

Thanks,
Florian