[OSG] Issues with the sky and moons

1. The moons are completely black in the OSG version of OpenMW.
2. There are no stars visible in the OSG version, the sky at night is pure blackness behind the clouds.
3. There is a weird dent in the sky in the OSG version, visible in the morning at about 9AM, when looking to the west, e.g. from Balmora.

See screenshots.

OpenMW version: OSG 64bit rev5d696204c4 OS: Windows 10 GPU: Geforce GTX 570

[Note: I apologize if any of this has already been fixed, but atm I'm only able to test rev5d696204c4]

(RM-2637 from redmine: created on 2015-06-09 by Thomas Staudinger, , closed on 2015-06-19 by scrawl ., relates #2693 (closed))

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