[v3] default linux allocator

[Benjamin Kosnik]

Yo dudes... this switches this default allocator for linux to
mt_allocator. I'd like to try this out on mainline, and then possibly
move this to the gcc-3_4-branch after a review of gcc-testresults.

Sound like a good idea? Barring objections, I'll do this tomorrow.

There also seemed to be interest in making this this default on solaris,
and perhaps others. I think these can be separate patches.

-benjamin
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