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

[Roger James]

>Attached is the modified src/osgDB/FileUtils.cpp , zipped up just to be
>sure.
>
>Thanks,
>
>J-S
>-- 

Thanks also for me J-S. I am sorry I could not help out on the testing but I
am still getting my build environment back together after the loss of my
laptop last week.

Roger