Fix failing build_ffi test under current nightly after rust-lang/rust#43067 landed.#126

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rillian merged 2 commits intomozilla:masterfrom

kinetiknz:nightly_fix

Nov 15, 2017

Commits on Nov 14, 2017

Fix failing build_ffi test under current nightly after rust-lang/rust#43067 landed.
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Run `make clean` as part of the build_ffi test.
kinetiknz
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