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merge revision(s) 48886: [Backport #10210]

    * configure.in (rb_cv_binary_elf): get rid of -e option of cat
      which is not available on BusyBox, use tr instead.
      [ruby-core:64824] [Bug #10210]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@49248 b2dd03c8-39d4-4d8f-98ff-823fe69b080e