Not entirely straightforward, some manual edits were done since when
this library was created, some of the work was already done.
- Remove any bf_imbuf_movie paths from INC
- Add a dependency though LIB when missing
- Add public dependency to bf_imbuf in bf_imbuf_movie since it uses the
imbuf headers in its public headers.
- Fix namespace not to have underscores
context: https://devtalk.blender.org/t/cmake-cleanup/30260
Pull Request: https://projects.blender.org/blender/blender/pulls/132407
95c1a5e4fe