[Truffle] Make native openssl the default and replace JRUBY_TRUFFLE_N…

…ATIVE_OPENSSL with JRUBY_TRUFFLE_SHIM_OPENSSL

lib/ruby/truffle/truffle/openssl.rb

@@ -6,14 +6,14 @@
 # GNU General Public License version 2
 # GNU Lesser General Public License version 2.1
 
-if ENV['JRUBY_TRUFFLE_NATIVE_OPENSSL']
-  require_relative '../openssl/openssl'
-else
+if ENV['JRUBY_TRUFFLE_SHIM_OPENSSL']
   # If loaded directly simulate as it was not found, it can added only
   # explicitly by loading openssl-stubs which makes it look like
   # openssl was loaded.
 
   load_error = LoadError.new("cannot load such file -- openssl")
   load_error.instance_variable_set :@path, 'openssl'
   raise load_error
+else
+  require_relative '../openssl/openssl'
 end