[ruby-cvs:70858] hsbt:r63772 (trunk): Added guard condition for old ruby about RubyVM::MJIT.

[hsbt at ruby-lang.org]

hsbt	2018-06-28 00:56:55 +0900 (Thu, 28 Jun 2018)

  New Revision: 63772

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63772

  Log:
    Added guard condition for old ruby about RubyVM::MJIT.
    
      Test libraries under the test/lib is used with default gems in
      their repositories. default gems may support old ruby like
      Ruby 2.5. When default gems invoke test libraries of Ruby core
      with old ruby, they raised
      `uninitialized constant RubyVM::MJIT (NameError)`

  Modified files:
    trunk/test/lib/minitest/unit.rb