glibc Hurd build fails with GCC 11

[Samuel Thibault]

Hello,

Joseph Myers, le lun. 02 nov. 2020 20:43:44 +0000, a ecrit:
> lookup-at.c:47:33: error: '__dir_lookup' reading 1024 bytes from a region of size 1 [-Werror=stringop-overread]
> 
> The second argument of __dir_lookup is declared (via hurd/fs.defs in the 
> Hurd sources) as of type string_t.  string_t is char[1024].

I have fixed these in the latest mig and hurd repositories, so one just
needs to re-run checkout to fix these.

Samuel