[Ohrrpgce] SVN: teeemcee/12443 gfx_sdl2: on Windows don't clear window when switching to/from fullscree

[subversion at HamsterRepublic.com]

teeemcee
2021-09-16 17:10:03 -0700 (Thu, 16 Sep 2021)
151
gfx_sdl2: on Windows don't clear window when switching to/from fullscreen (as in last commit)

Turns out to be harmful on Windows though helpful on X11
---
U   wip/gfx_sdl2.bas