Revert "build system: fix object names for vout_ios2 and ios dialog provider"

This reverts commit 09e5b394ff228fa8d3f79432ef283b3defc2cdbf.
Revert "Add basic iOS dialog provider"

This reverts commit ea6e923fc9915b60002cdb4a2a7fc2b17d6d12d9.
Don't build x265 by default.

It fails for me and I don't care to investigate in this branch.