* include/ruby/intern.h (rb_f_lambde): restore the declaration of
  rb_f_lambda() for backword compatibility. and mark it as deprecated.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@42145 b2dd03c8-39d4-4d8f-98ff-823fe69b080e