CentOS-7 (1810)'s header has O_TMPFILE but kernel doesn't support it

http://rubyci.s3.amazonaws.com/centos7/ruby-trunk/log/20181206T080003Z.diff.html.gz

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66334 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_file.rb

@@ -504,6 +504,8 @@ class TestFile < Test::Unit::TestCase
         io = File.open(tmpdir, File::RDWR | File::TMPFILE)
       rescue Errno::EINVAL
         skip 'O_TMPFILE not supported (EINVAL)'
+      rescue Errno::EISDIR
+        skip 'O_TMPFILE not supported (EISDIR)'
       rescue Errno::EOPNOTSUPP
         skip 'O_TMPFILE not supported (EOPNOTSUPP)'
       end