* config.sub: Properly parse the KERNEL-OS case.

[John Ericson]

Hi Ben,

I guess I am getting back to the refactoring I was doing before for one 
last round, so now finally no two components are ever conflated:

    * config.sub: Properly parse the KERNEL-OS case.

    I previous parsed basic_machine into separate `cpu` and `kernel`
    variables, I parse `basic_os` (a rename of `os` when used early on) 
into
    `kernel` and `os`.

    Like before, this does make thins a bit longer, but I think it 
makes the
    code understand and more robust, and so is worth the cost.

    * config.sub: Move OS whitelist to bottom of case. This is in 
preparation
    for the following commit.

Hope it looks good to you.

Cheers,

John

0001-config.sub-Move-OS-whitelist-to-bottom-of-case.-This.patch
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0002-config.sub-Properly-parse-the-KERNEL-OS-case.patch
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