ports that can run binaries that need other libraries. Like
   sparc and sparc64, possibly mips and mips64 (or whatever MIPS
   LP dialect), and in the future ia64, which can run ia32 binaries.

actually, there are at least 3 mips ABI's we probably want to support...
   
   Perhaps we should at least add support for /usr/lib/<platformid>
   in the dynamic linker, but not make it the default. Opinions?

don't like it cuz it doesn't solve the problem of where ld.so goes...