Fix "-mt" for SDLMAME windows build [Calamity, Couriersud].
Merge branch 'master' of https://github.com/mamedev/mame.git
chihiro: add support for vblank wait NV2A accelarator method (nw)

It is disabled by default since is slows down too much.
There is a new debugger command "chihiro waitvblank" to enable and disable it.
Changed sdl_window_info to be closer to C++:
- Made some members private
- moved static functions into sdl_window_info
- extended work_param struct with constructors for better readability
Merge https://github.com/mamedev/mame