[osg-submissions] fix for the softshadowmap-shader for OS X

[Stephan Maximilian Huber]

Hi Robert,

the softshadowmap-implementation does not compile on os x, to be more 
precise, the shader does not compile on os x because of some 
type-conflicts ala "can not convert from const int to const float"

So I changed the offending lines to force the type of the vars. It works 
now on OS X (albeit very slowly, 3fps on a 7300), perhaps you find the 
changes useful. Note: perhaps there is a better way in shaders to 
cast/convert from int to float and viceversa.

cheers,
Stephan

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