[PATCH] hugin build fix

[Przemo Firszt]

Change BuildRequires from OpenGL-glut-devel to glut-devel

With this fix hugin compiles and works, but there is a problem with
saving finished panorama to tif format which is rather not related to
using glut.

Please test & apply.

-- 
Przemo Firszt <przemo at firszt.eu>
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