Per requests from the community, commit rudimentary cross compilation

support.  I've been building world with these changes for months w/o
ill effect.  I've also managed to build the cross tool chain for MIPS
with these patches.

Please note that the extent to which these patches work is largely
dictated by how well our tool chains support the cross compilation.
Building alpha binaries on i386 doesn't work.  Supposedly building
i386 binaries on alpha does work, but I've not verified it with these
patches, however.

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