Revert "Skip debase extconf.rb on non-CRuby"

This reverts commit 0371c65.

Author: hurricup

ext/attach/extconf.rb

@@ -1,4 +1,4 @@
-if defined?(RUBY_ENGINE) && RUBY_ENGINE != 'ruby'
+if defined?(RUBY_ENGINE) && 'rbx' == RUBY_ENGINE
   # create dummy Makefile to indicate success
   f = File.open(File.join(File.dirname(__FILE__), "Makefile"), "w")
   f.write("all:\n\techo all\ninstall:\n\techo installed\n")

ext/extconf.rb

@@ -1,4 +1,4 @@
-if defined?(RUBY_ENGINE) && RUBY_ENGINE != 'ruby'
+if defined?(RUBY_ENGINE) && 'rbx' == RUBY_ENGINE
   # create dummy Makefile to indicate success
   f = File.open(File.join(File.dirname(__FILE__), "Makefile"), "w")
   f.write("all:\n\techo all\ninstall:\n\techo installed\n")

lib/debase.rb

@@ -1,8 +1,5 @@
 if defined?(RUBY_ENGINE) && 'rbx' == RUBY_ENGINE
   require 'debase/rbx'
-elsif defined?(RUBY_ENGINE) && RUBY_ENGINE == 'truffleruby'
-  require "debase/version"
-  return
 else
   require "debase_internals"
 end