Planet migration no longer works with new AMUSE build system

[ErwanH29]

After testing PACE on the new AMUSE build system, planets return nan as their positions.
Using the previous working version of amuse (commit 8dd292c) restores the correct behaviour.
Essentially, the required files no longer build.

[ErwanH29]

Never mind, Lourens has fixed this in AMUSE issue #1172. Awaiting to be merged.