From: Kurt Garloff <garloff@suse.de>

A patch to parse the elf binaries for a PT_GNU_STACK section to set the stack
non-executable if possible.  Most parts have been shamelessly stolen from
Ingo Molnar's more ambitious stackshield
http://people.redhat.com/mingo/exec-shield/exec-shield-2.6.4-C9

The toolchain has meanwhile support for marking the binaries with a
PT_GNU_STACK section wwithout x bit as needed.

If no such section is found, we leave the stack to whatever the arch defaults
to.  If there is one, we explicitly disabled the VM_EXEC bit if no x bit is
found, otherwise explicitly enable.