Modify openssl in-place to not escape to native global variables whic…

…h need to be managed

Documentation update for GraalVM 0.21

Set sulong.LLVM=3.2 for now

[Truffle] Assume that Graal is automatically set up if RUBY_BIN is set.

Merge branch 'master' into truffle-head

# Conflicts:
#	ci.hocon
#	truffle/src/main/java/org/jruby/truffle/language/DataNode.java

[Truffle] Do not use the build pack on truffle-head as it won't conta…

…in the latest truffle.

[Truffle] Don't change the environ in mx.