Use MikePurvis fix for recent CMake support

[mikaelarguedas]

For some reason I didnt succeed to open a PR towards this fork.

To reduce the amount of deprecation warnings while building ROS 1 packages on recent platforms it would be great to integrate this PR ros#1195 from @mikepurvis into the ros-o version.

WDYT ?

[mikaelarguedas]

@rhaschke @v4hn what do you think about this ? Is this considered too cosmetic (as catkin can run without errors without it) to be included in the ros-o version of catkin ?

[rhaschke]

Thanks for pinging me. This looks reasonable at first sight, but I will have a deeper look later.

[rhaschke]

Merged: 5a4540c

[v4hn]

Also merged in Debian ros-catkin 0.8.10-17.