pwnat: Fix evaluation
perl: Update to 5.16.3, 5.14.4

CVE-2013-1667

Cherry-picked from stdenv-updates.
glibc: Remove 2.13

It's not used and has security bugs.
glibc: Require Linux 2.6.32 instead of 2.6.35

By popular demand.  For instance, many widely used RHEL systems are
still on 2.6.32.
glibc: Security fixes.

CVE-2013-0242, CVE-2013-1914.