Mesa 24.3 Removes Support For The Long-Abandoned OpenMAX API

Some long-rotting code in Mesa has been flushed out today... Mesa 24.3 is now 11.6k lines of code lighter after removing support for the OpenMAX (OMX) API that was implemented as a Gallium3D state tracker long ago and hasn't seen any activity in recent years and the upstream OpenMAX standards work halted more than one decade ago...