driver: Only run a dynamic-too pipeline if object files are going to be generated

Otherwise we run into a panic in hscMaybeWriteIface: "Unexpected DT_Dyn state
when writing simple interface" when dynamic-too is enabled

We could remove the panic and just write the interface even if the state is `DT_Dyn`,
but it seems pointless to run the pipeline twice when `hscMaybeWriteIface` is already
designed to write both `hi` and `dyn_hi` files if dynamic-too is enabled.

Fixes #23944.