Summary:
Description:

Prior to this patch it was not possible to run open/r on linux running on ARM due to cmake and openssl being harded to download/compile for the x86_64 arch.

In order to prevent such problem this patch actively compiles cmake instead of using pre-compiled binaries and also allows the OpenSSLBuilder to provide the correct build args to openssl, thus not trying to compile or run x86_64 software.

Pull Request resolved: https://github.com/facebook/openr/pull/95

Test Plan: * built the project by using ./build/build_openr.sh

Reviewed By: wez

Differential Revision: D28224684

Pulled By: cooperlees

fbshipit-source-id: 9de61dc6d7dcf7116ec5c67f3f165cd4a4bb5e5c