we need to move away from the magic-ABI-env-vars that gcc-config uses to hook 
in flags transparently.  as such, i'm changing multilib.eclass' 
multilib_toolchain_setup so that it sets each toolchain component explicitly:
export CC="$(tc-getCC) $(get_abi_CFLAGS)"

seems to work on the few packages that actually do ABI-changes inside of the 
ebuild, but in case people's multilib packages break, this should be an easy 
thing to check.
-mike

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