Add definition for TruffleRuby 1.0.0 RC2

Author: eregon

share/ruby-build/truffleruby-1.0.0-rc2

@@ -0,0 +1,7 @@
+install_package "openssl-1.1.0h" "https://www.openssl.org/source/openssl-1.1.0h.tar.gz#5835626cde9e99656585fc7aaa2302a73a7e1340bf8c14fd635a62c66802a517" mac_openssl --if has_broken_mac_openssl
+
+if is_mac; then
+  install_package "truffleruby-1.0.0-rc2" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc2/truffleruby-1.0.0-rc2-macos-amd64.tar.gz#308a5bf727914803cc0f794fd1aea89fd5f80ce00a97120372be9c58a930b82c" truffleruby
+else
+  install_package "truffleruby-1.0.0-rc2" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc2/truffleruby-1.0.0-rc2-linux-amd64.tar.gz#2b7d999646dcfb895e49a41606a0b53ca055f291fb0cc33002944655fc3e2acb" truffleruby
+fi