Bug#769529: libgazebo-dev: arch-dependent file in "Multi-Arch: same" package

[Jose Luis Rivero]

Source: gazebo
Followup-For: Bug #769529

Thanks for the report and for the comments. Leo is right, this has
nothing to do with Multi-Arch although discovered a problem of releasing
compilation PATHs.

I've reported it upstream and create a patch that hopefully will be in
the next version:

https://bitbucket.org/osrf/gazebo/issue/1627

Please reopen if needed.