Fix any_spec

Use the appropriate arity to get Enumerable#any to handle its args
correctly.  Note that we need to switch from JavaInternalBlockBody to a
BlockCallback since JavaInternalBlockBody does not properly respect its
arity in 1_7.
Merge pull request #1234 from dmarcotte/any-spec-1_7

Fix any_spec
Merge jruby-1_7 to master