Log Message:
Switch packages using GLUT to FreeGLUT.

Start building FreeGLUT with GLUT compatibility on.

- GLUT's maintainance state is much worse than FreeGLUT's, with no
  substanital commits since 2011.
- GLUT can no longer be consider a core component of Mesa or X11.
- Nobody except us seems to be using it...

Other vendors still shipping GLUT:
- GoboLinux, T2 SDE, PLD Linux

Revbump packages using GLUT or freeglut by default.