[osg] Fix link error caused by static tiff library

[Haojia521]

osg fails to build because tiff is static library. #5889

The unresolved external symbols mainly form two libraries, jpeg and liblzma, so i add them to the target libs of osg plugin osgdb_tiff. And it seems to work.

[ras0219-msft]

It might be better to use TIFF_LIBRARIES[1].

Alternatively, we could include the dependencies inside the TIFF_LIBRARY variable.

[1] https://github.com/Kitware/CMake/blob/73472408c501e66c9dd8c027293b8c0907001b42/Modules/FindTIFF.cmake#L29-L30

[Haojia521]

hi, @ras0219-msft . It's really a better way to use TIFF_LIBRARIES. In vcpkg, TIFF_LIBRARIES also includes the dependency libs(jpeg, lzma, zlib). Thanks your advice.

[ras0219-msft]

Thanks for the PR!

It looks like this is actually fixed by #6000, which adds the extra dependency libs to TIFF_LIBRARY. I definitely agree that osg should use TIFF_LIBRARIES, but since vcpkg is unblocked the right path forward would be to submit this to the upstream project: https://github.com/openscenegraph/OpenSceneGraph