remove unintended duplicate

this should have went in with the previous commit

Fix the build. Commented out code that is missing #defines

add direct support for hardware cursor on Summit

some udates:
- don't use hwmode, just track read- and write mode directly
- use FIFO pacing now that we know how, only stall the engine if we need to
access video memory or change buffer access modes
- use a back buffer as off-screen memory, modify Prepare*() etc. accordingly

this should have went in with the last summit_accel.c commit..

add *very* experimental Visualize FX support

add acceleration, Visualize EG only for now

very humble beginnings of a native driver for HP's NGLE family of graphics
devices