[OE-core] Adding Bash to meta-toolchain.

[Kucharczyk, Bartlomiej (Nokia - PL/Wroclaw)]

> Why do you want to install bash to the toolchain?  

There are several reasons for doing that:
+ I would like to create an SDK with every tool that is needed for the compilation; 
    + to make SDK as much host tools independent as possible;
    + to make builds that use SDK much more deterministic (when using different build hosts);
+ I would like to support RHEL5 (still), where bash 3 is default;
+ and, finally, because I can (bash.bb recipe allows me to do that);

I could ask: Why nativesdk-bash is for? It does not work.

Bartek