[patch] add support for rotated linux framebuffers

i brought this up some time ago but hadnt gotten a real chance until now to
put together a patch … to refresh people’s minds, the issue at hand is that
some framebuffer devices are rotated so you’ll have resolutions like 240x320
rather than 320x240. while we could duplicate all the scannable resolutions
and their vsync values, that’s no fun

so in the attached patch, i have the framebuffer code swap the X and Y values
and do a second pass for each vesa entry

this is a copy & paste patch from 1.2.9 to latest svn, i’m just unable to
compile latest svn at the moment it would seem (the DirectFB and FBCON video
drivers fail)
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