app-shells/bash: bump to 4.2_p48

Fixes a remote code execution exploit.
http://seclists.org/oss-sec/2014/q3/649
app-shells/bash: sync ebuild and patches
bash: sync up with latest version in Gentoo

This fixes another piece of the mess but the story isn't over yet.

http://www.openwall.com/lists/oss-security/2014/09/25/10
https://bugs.gentoo.org/show_bug.cgi?id=523592
bash: fix CVE-2014-7169

http://www.openwall.com/lists/oss-security/2014/09/26/1
Merge pull request #884 from marineam/bash-410

Bash backport for 410