GLU is independent of your GL implementation (as long as your GL implementation supports the spec that that version of GLU was written for).
Using Mesa's GLU libs should not cause any problems. Do you have source for wings3d? If so, you could build a debug version, run it through gdb, and see where exactly that it's segfaulting.
If not, I can send you my libGLU.so* files if you want. They live in /usr/X11R6/lib, and were installed with X. They seem to work fine, although I don't have wings3d.
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