Revert "Updated clang recipe for clang 3.4."
Revert "Updated clang recipe for clang 3.4."

The ark we use does not work with xz file extensions, and thus clang 3.4 does not install.
Reverting for now until I have time to update ark and then clang.

This reverts commit 5a15cbac0ee399aa0a53b5cb56e76d0f0eab5719.

DanielG/travis-cookbooks,DanielG/travis-cookbooks,dstufft/travis-cookbooks,dracos/travis-cookbooks,ardock/travis-cookbooks,Distelli/travis-cookbooks,dracos/travis-cookbooks,ardock/travis-cookbooks,spurti-chopra/travis-cookbooks,tianon/travis-cookbooks,Acidburn0zzz/travis-cookbooks,Acidburn0zzz/travis-cookbooks,vinaykaradia/travis-cookbook-cloned,Zarthus/travis-cookbooks,Acidburn0zzz/travis-cookbooks,travis-ci/travis-cookbooks,gavioto/travis-cookbooks,dracos/travis-cookbooks,Zarthus/travis-cookbooks,Acidburn0zzz/travis-cookbooks,tianon/travis-cookbooks,tianon/travis-cookbooks,dracos/travis-cookbooks,travis-ci/travis-cookbooks,bd808/travis-cookbooks,vinaykaradia/travis-cookbook-cloned,bd808/travis-cookbooks,ljharb/travis-cookbooks,johanneswuerbach/travis-cookbooks,dstufft/travis-cookbooks,spurti-chopra/travis-cookbooks,tianon/travis-cookbooks,vinaykaradia/travis-cookbook-cloned,ljharb/travis-cookbooks,ardock/travis-cookbooks,vinaykaradia/travis-cookbook-cloned,gavioto/travis-cookbooks,johanneswuerbach/travis-cookbooks,DanielG/travis-cookbooks,johanneswuerbach/travis-cookbooks,spurti-chopra/travis-cookbooks,Zarthus/travis-cookbooks,Distelli/travis-cookbooks,tianon/travis-cookbooks,ardock/travis-cookbooks,DanielG/travis-cookbooks,ljharb/travis-cookbooks,Zarthus/travis-cookbooks,bd808/travis-cookbooks,gavioto/travis-cookbooks,Distelli/travis-cookbooks,gavioto/travis-cookbooks,vinaykaradia/travis-cookbook-cloned,travis-ci/travis-cookbooks,Distelli/travis-cookbooks