[OSG] Rain not visible

Rain is not visible (but audible) in the OSG version of OpenMW

OpenMW version: OSG 64bit rev 5d696204c4, by Ananace

OS: Windows 10 64bit GPU: Geforce GTX 570

(RM-2632 from redmine: created on 2015-06-08 by Thomas Staudinger, , closed on 2015-06-25 by scrawl ., relates #2111 (closed), duplicates #2672 (closed))

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