Another BASH Update

Here comes another bash update to fix more security vulnerabilities. This time, a patch from Florian Weimer changes the encoding bash uses for exported functions to avoid clashes with shell variables and to avoid depending only on an environment variable's contents to determine whether or not to interpret it as a shell function. This change causes a backward incompatible break, but most of your scripts should be safe and continue to work as it is, unless you use the affected features. As always, please upgrade ASAP.