Neil Roberts 9f107ab3fb Support window resizing in the SDL 2 winsys
The SDL2 winsys will now set the SDL_WINDOW_RESIZABLE flag on the
window before creating it if the resizable property is set on the
onscreen. Note that there doesn't appear to be a way in SDL to change
the flag later so unlike the other winsyses it will only take affect
if it is set before allocating the framebuffer.

The winsys now registers a callback for SDL events so that it can
report window size changes back to the application.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 0dea9aeb897faf029828379b120970477df3c7d5)
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