Re-do the FreeBSD cross-builds to use Clang and libc++. Fixes #44433.#45077

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jld wants to merge 1 commit intorust-lang:masterfrom jld:freebsd-build-update

+115-234

Commits on Oct 6, 2017

Re-do the FreeBSD cross-builds to use Clang and libc++. Fixes rust-lang#44433 .
jld
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