glibc i686 build

[Samuel Thibault <samuel.thibault@gnu.org>]

Hello,

I have fixed the i686 build of glibc:

- 3904414a3008751ffcaf18fbe33bd34812b7bfe5 fixes the
  _hurd_self_sigstate reference from
  sysdeps/mach/hurd/i386/____longjmp_chk.S, which was making the final
  libc.so link fail with a newer binutils.

- ifunc is not working yet with static binaries, so I had to use
  export libc_cv_ld_gnu_indirect_function=no
  before running configure, to disable the feature.

Samuel