package/glibc: bump version for additional post-2.30 security fixes

Fixes the following security vulnerabilities:

CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
  corruption when they were passed a pseudo-zero argument.  Reported by Guido
  Vranken / ForAllSecure Mayhem.

CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
  out-of-bounds write when executed in a signal frame context.

CVE-2020-1752: A use-after-free vulnerability in the glob function when
  expanding ~user has been fixed.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>