better codedump format
Fiber.new{break} caused SEGV
disable LocalJumpError test since the code causes SyntaxError (not LocalJumpError) on CRuby
add RUBY_VERSION to notify syntax compatible version
pass gem_flags_after_libraries
Merge pull request #1683 from take-cheeze/gem_flags_after_libraries

Pass forgotten variable gem_flags_after_libraries to tool's linker.run.