Add SGX target#1124

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jethrogb wants to merge 3 commits intorust-lang:masterfrom

jethrogb:jb/sgx-target

Commits on Nov 20, 2018

Factor out platforms for which libc is empty
gnzlbg
committed
Move function definitions to platform-specific modules
Jethro Beekman
committed
Add SGX target
Jethro Beekman
committed