Stellarium / stellarium / 11396193484

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Rewrite spheric mirror to make it more efficient

The old version rewrote VBO about 150×3 times per frame, which is very
inefficient, especially given that the data written never change.
This version writes these constant data once in the constructor of the
distorter and uses them on rendering.

Fixes #3535

0 of 99 new or added lines in 1 file covered. (0.0%)

14434 of 119607 relevant lines covered (12.07%)

18715.7 hits per line