sdlapp: Enable compilation of most apps/games
Removes `#ifdef`s in many places to just have `HAVE_TOUCHSCREEN` be the
input fall back, as is already tentatively the case in the code.
Solitaire was the only app excluded since there aren’t enough buttons
for it mapped in the SDL layer.
Change-Id: I62450b7110b86c8037a121e96cd2e46754be79a3
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