k0kubun f13b0fd8f3 jit_support.rb: debug check_support stderr
rubyci freebsd11zfs doesn't pass this check. I want to know the stderr.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63507 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-05-27 07:33:18 +00:00
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