use SDL_Threads everywhere The trick was to mark the threaded functions as cdecl and load arguments correctly. This allows us to: - drop a few ifdefs; - use integrated waiting code; - remove some whitespaces \o/; - fix bug #591.

[patterns]
**.h = native
**.c = native
**.cpp = native
**.lua = native
**.txt = native
**.pas = native
**.inc = native
**.hs = native