This update for glibc fixes the following issues:

Security issues fixed:
- arm: mark __startcontext as .cantunwind (CVE-2016-6323, boo#994359, BZ #20435)

Bugs fixed:
- aarch64: Merge __local_multiple_threads offset with memory reference
- Fix memory leak in regexp compiler (BZ #17069)
- Provide correct buffer length to netgroup queries in nscd (BZ #16695)
- Use NSS_STATUS_TRYAGAIN to indicate insufficient buffer (BZ #16878)
- aarch64: End frame record chain correctly (BZ #17555)
- _IO_wstr_overflow integer overflow (BZ #17269)
- Fix nscd lookup when netgroup has wildcards (BZ #16758, BZ #16759)
- Avoid overlapping addresses to stpcpy calls in nscd (BZ #16760)
- resolv: Always set *resplen2 out parameter in send_dg (boo#994576, BZ #19791)
- Fix memory handling in strxfrm_l (BZ #16009)
- Harden tls_dtor_list with pointer mangling (BZ #19018)
- open and openat ignore 'mode' with O_TMPFILE in flags (BZ #17523)