bash: address recent CVEs (shellshock, etc.)

Grabbed the current, relevant bash 4.2 patches from OE dylan
and tested the various demonstration exploits found at:
https://shellshocker.net/.

OXT-7
Signed-off-by: Chris Patterson <pattersonc@ainfosec.com>
Merge pull request #25 from cjp256/oxt-7-v1

[OXT-7] bash: address recent CVEs (shellshock, etc.)