Add rbx-2.6.0, rbx-2.7.0, rbx-2.8.0, rbx-2.9.0

share/ruby-build/rbx-2.6.0

+require_llvm 3.5
+install_package "openssl-1.0.1q" "https://www.openssl.org/source/openssl-1.0.1q.tar.gz#b3658b84e9ea606a5ded3c972a5517cd785282e7ea86b20c78aa4b773a047fb7" mac_openssl --if has_broken_mac_openssl
+install_package "rubinius-2.6" "https://rubinius-releases-rubinius-com.s3.amazonaws.com/rubinius-2.6.tar.bz2#f63bbcca7d1bc71b4c20a3bd5748430be001f3a39b14a903d3d4ca39a657cfe0" rbx

share/ruby-build/rbx-2.7.0

+require_llvm 3.5
+install_package "openssl-1.0.1q" "https://www.openssl.org/source/openssl-1.0.1q.tar.gz#b3658b84e9ea606a5ded3c972a5517cd785282e7ea86b20c78aa4b773a047fb7" mac_openssl --if has_broken_mac_openssl
+install_package "rubinius-2.7" "https://rubinius-releases-rubinius-com.s3.amazonaws.com/rubinius-2.7.tar.bz2#6f121cccbbd5ad0183024bf2405ca627982d1890307c059c754a1847e19eadd1" rbx

share/ruby-build/rbx-2.8.0

+require_llvm 3.5
+install_package "openssl-1.0.1q" "https://www.openssl.org/source/openssl-1.0.1q.tar.gz#b3658b84e9ea606a5ded3c972a5517cd785282e7ea86b20c78aa4b773a047fb7" mac_openssl --if has_broken_mac_openssl
+install_package "rubinius-2.8" "https://rubinius-releases-rubinius-com.s3.amazonaws.com/rubinius-2.8.tar.bz2#93e798b4c79800d0543d8d78aa1066b4285af209ed9908c35e54260c13bc7e9d" rbx

share/ruby-build/rbx-2.9.0

+require_llvm 3.5
+install_package "openssl-1.0.1q" "https://www.openssl.org/source/openssl-1.0.1q.tar.gz#b3658b84e9ea606a5ded3c972a5517cd785282e7ea86b20c78aa4b773a047fb7" mac_openssl --if has_broken_mac_openssl
+install_package "rubinius-2.9" "https://rubinius-releases-rubinius-com.s3.amazonaws.com/rubinius-2.9.tar.bz2#9f8ad067ce494d201dae359d132ddac275d0bd13315dc8fdd094c9aa661ce8b1" rbx