[v3, 3.4 & HEAD] set cpu_include_dir for mips*-*-linux* targets, update baseline file

[Mark Mitchell]

Matthias Klose wrote:

>The mips*-*-linux* targets are currently recognised as "generic".
>This seems to be wrong, as there is an old mips-linux-gnu baseline
>file. The following patch explicitely overwrites the configuration for
>the mips*-*-linux* in the last case statement.
>
>Not appending the baseline diff here.
>
>Currently running the libstdc++ testsuite. Ok to checkin, provided
>that there are no regressions?
>  
>
Yes.

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Mark Mitchell
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