Auto merge of #2485 - japaric:no-cross-doctests, r=alexcrichton
authorbors <bors@rust-lang.org>
Tue, 15 Mar 2016 16:57:46 +0000 (09:57 -0700)
committerbors <bors@rust-lang.org>
Tue, 15 Mar 2016 16:57:46 +0000 (09:57 -0700)
don't build/run doctests when target != host

fixes rust-lang/rust#31907

r? @alexcrichton


Trivial merge