Remove cdaudio flags, flush screen more aggressively

cd audio still exists under the hood. It should be removed more
completely eventually, though this will also require changing the save
format.
Fix ./configure flag order; Windows captioning

The flag ordering does matter for many compilers.

I think SDL2 sets the wmtitle correctly without the old ifdef. If not,
it'll have to be fixed because the info struct changed.
Merge branch 'master' of https://github.com/sekaiproject/ponscripter-fork