add missing dependency for openvdb[tools]

[githubkusi]

Currently, I get an error when building openvdb with [tools] feature (x64-windows triplet) with the following build command:

vcpkg.exe install openvdb[tools]:x64-windows    

Error message

c:\...\buildtrees\openvdb\src\v5.0.0-7f1d479828\openvdb\points\IndexFilter.h(51): fatal error C1083: Cannot open include file: 'boost/ptr_container/ptr_vector.hpp': No such file or directory

Adding the dependency lets me successfully build and execute vdb_view.exe. However, I need to copy vdb_view.exe into the <VCPKGROOT>\installed\x64-windows\bin directory in order for vdb_view.exe to work. I don't know if this is a deliberate decision or a bug to not copying the exe to this directory.

[ras0219-msft]

Thanks for the PR and sorry for the delay!

As for the vdb_view.exe issue, all the dependency dlls should have been copied into the tool directory via vcpkg_copy_tool_dependencies() -- what's missing?