[Buildroot] support for cortex m3/m4 with newlib

[Cjw X]

I've been working on modifying buildroot to support cortex m3/m4 processors
against the newlib library.

This way I can use buildroot to build RTOS's for those processors. I've
been using buildroot for years to build linux systems and I would like to
expand that for the smaller processors with different operating systems.

I am making some progress. The toolchain already works. I'm now starting to
go down the road of supporting RTOS's.

I'm going to keep going regardless, but I wanted to check to find out if
this interests the community.

Does this interest people?

-Chris
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