[DRE-maint] Bug#959571: ruby-psych: FTBFS: LoadError: no such file to load -- psych

[Mike Gerow]

Did another rebuild from sid today and this package still fails to
build, but in a slightly different way now:

> NameError: undefined method `default_specifications_dir' for class `#<Class:0x5860f3d7>'
>   singleton class at /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:84
>            <main> at /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:58
>           require at org/jruby/RubyKernel.java:956
>            <main> at /usr/share/jruby/lib/ruby/stdlib/rubygems.rb:1
>           require at org/jruby/RubyKernel.java:956
>            <main> at /usr/share/jruby/lib/ruby/stdlib/rubygems.rb:1347
>              load at org/jruby/RubyKernel.java:974
>            <main> at uri:classloader:/jruby/kernel/gem_prelude.rb:1

Full build log attached.
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