[osg-submissions] Adding soversion support to osgversion

[Michael Wittman]

Hi Robert,

Attached are changes to support osgversion printing the soversion for
OSG and OpenThreads.  Printing the standard version for OpenThreads is
also supported for good measure.

As I mentioned on osg-users, this is useful if OSG_MSVC_VERSIONED_DLL is
enabled so that scripts can determine the soversion and thus manipulate
OSG DLLs using exact filenames.

This *does not* fix the problem where the OpenThreads DLL name uses the
OSG soversion.

-Mike
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