[Ohrrpgce] SVN: teeemcee/11675 gfx_sdl2: fix no image (white-filled window) on X11 with SDL 2.0.14

[subversion at HamsterRepublic.com]

teeemcee
2020-04-03 23:30:15 -0700 (Fri, 03 Apr 2020)
288
gfx_sdl2: fix no image (white-filled window) on X11 with SDL 2.0.14

SDL_SetHint(SDL_HINT_RENDER_OPENGL_SHADERS, "0") worked fine with SDL 2.0.10

I hope this also fixes the same problem I had on Mac which mysteriously
started for no apparent reason, but I can't test it myself right now.
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U   wip/gfx_sdl2.bas