bump base (#3803)
bump base (#3803)

Includes:

* [fix] ffi/framebuffer_android: separate invert blitbuffer https://github.com/koreader/koreader-base/pull/625
  Fixes #3529.
* SDL2: handle SDL_WINDOWEVENT_EXPOSED https://github.com/koreader/koreader-base/pull/624

  The next buffer might always contain garbage, and on X11 without
  compositing the buffers will be damaged just by moving the window
  partly offscreen, minimizing it, or putting another window
  (partially) on top of it.

  Handling `SDL_WINDOWEVENT_EXPOSED` is the only way to deal with
  this without sending regular updates.
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