[cpp] Animations with IK Constraints not behaving as expected

[cp4117]

I've noticed an issue in IkConstraint.cpp which leads to animations that use such constraints to not animate correctly.

Going through the json implementation I noticed the label break_outer is in a different location. Moving this goto label from line 240 to 176 to line up with the json implementation appears to fix the issue.

[badlogic]

I've tried to reproduce this with our stretchyman example, which triggers the goto break_outer. It behaves as expected and in line with the reference implementation. Happy to reopen if you can supply me with an animation that does not work for you.