[ruby-cvs:72524] naruse:r65424 (trunk): Revert "Add test for cause on pty"

[naruse at ruby-lang.org]

naruse	2018-10-29 02:03:36 +0900 (Mon, 29 Oct 2018)

  New Revision: 65424

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65424

  Log:
    Revert "Add test for cause on pty"
    
    This reverts commit r65422.

  Modified files:
    trunk/test/ruby/test_backtrace.rb