* .travis.yml: enabled test results of linux.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47772 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* test/ruby/test_io.rb (TestIO#test_advise): avoid to infinite loop.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47773 b2dd03c8-39d4-4d8f-98ff-823fe69b080e