Add support for x86_64-fortanix-unknown-sgx target#738

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akash-fortanix wants to merge 5 commits intobriansmith:mainfrom akash-fortanix:sgx-target

Commits on Feb 7, 2019

Implement entropy source for SGX

Jethro Beekman
and
akash-fortanix
committed
Disable AES/GCM Fallback implementations on SGX
Jethro Beekman
committed
Optionally use std::is_x86_feature_detected for feature detection
Jethro Beekman
committed
Add x86_64-fortanix-unknown-sgx to CI
Jethro Beekman
committed
Add SGX-specific notes to the documentation
Jethro Beekman
committed