Change the type of crust fns to `extern "C"`#8666

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nikomatsakis wants to merge 3 commits intorust-lang:masterfrom

nikomatsakis:issue-3678-extern-fn-types

Commits on Aug 21, 2013

Fix crash(!) by using the *Rust fn type* not the extern fn type
nikomatsakis
committed
Change type of extern fns from `*u8` to `extern "ABI" fn`
nikomatsakis
committed
Adjust callbacks in the libraries for the new type of extern fns
nikomatsakis
committed