* test/ruby/test_io.rb (TestIO#test_advise): added workaround of fadvise(2)
  with tmpfs and old linux kernel. [ruby-core:65355][Bug #10313]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47771 b2dd03c8-39d4-4d8f-98ff-823fe69b080e