[osg-submissions] Plugin DLL search order fix for Win32

[Luigi Calori]

Tsted under winxp:
it works ok, just two notes:

1)
 it is designed to search anyway for system and current directory before 
PATH defined folders: this prevet an application writer to
set PATH env var to override presence of system installed  plugins. 
Would not be better to reverse the order?
like
<application_folder>/osgPlugins<osgversion> ; 
<PATH_folder>/osgPlugins<osgversion>; ..... 
<PATH_folder>/osgPlugins<osgversion>;<SYSTEM_folder>/osgPlugins<osgversion>;<CurrDir_folder>/osgPlugins<osgversion>;

2)
in VisualStudio builds, the projects appends /Debug or /Release to the 
folders where dll are created at build time,
 I was used to test osg build BEFORE installing by setting up PATH 
environment to build folders.
With current enforced versioned plugin this is impossible as projects 
place plugin dll in lib/osgPlugins<osgversion>/<Debug or Release>
 I attach a patch that change the build folder placement to lib/<Debug 
or Release>/osgPlugins<osgversion>
that seems also more consistent.
The patch should not affect other platform builds


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