crosstool 0.21, use for native cross

[Shay Gal-On]

A few issues I ran into:
1. As well as testing for $CC defined, should check for $AR defined (for the same reason).
2. Make sure the target compiler on the build machine is in the path (otherwise glibc configure fails).
3. Make sure the output directory for the native compiler is not the same as the directory for the cross compiler (target name is the same, will delete ..)

Other then that, build was successful. Definitely saved a lot of time :)
Now to validate it...

- Shay

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