[Buildroot] [RFC 1/1] br2-external: Alow to include toolchain from external tree

[Yann E. MORIN]

Vadim, Arnout, All,

Here's my take on the topic (still WIP, but mostly there, needs commit
log):

    https://git.buildroot.org/~ymorin/git/buildroot/log/?h=yem/br2-ext-toolchain

I'll be off until Monday, when I'll write proper commit log before
submitting it.

Regards,
Yann E. MORIN.

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