[Ohrrpgce] SVN: teeemcee/8039 mac/gfx_sdl: try a higher zoom (up to 4x) when full-screening rather tha

[subversion at HamsterRepublic.com]

teeemcee
2016-06-05 05:28:30 -0700 (Sun, 05 Jun 2016)
357
mac/gfx_sdl: try a higher zoom (up to 4x) when full-screening rather than 2x

Now that the game resolution can be changed to something smaller, 2x may be too
conservative (4x may also be too conservative), and 640x400 looked bad anyway,
especially with the mouse cursor visible.
If the zoom is too high, it'll simply fallback to the smallest one that works.
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U   wip/gfx_sdl.bas