[syslinux] Patch to vesamenu.c32 from Syslinux 3.51

[H. Peter Anvin]

Collins, Jeremy wrote:
> I was having a display problem with memtest86 and dos via a memdisk
> image not displaying properly when launched using vesamenu.c32 and using
> a PNG background image. Instead of proper text output the display mode
> is not changed and the existing menu image is corrupted by the outputted
> text. This seems to be similar or identical to a problem describe in a
> previous mailing:
> http://syslinux.zytor.com/archives/2007-May/008442.html
> 
> Many kernels and OS seem to assume the display will still be in text
> mode and do not change the video mode prior to writing text. After
> launching these kernels create corruption in the existing displayed
> image and/or make it appear as though the system is hung while the
> underlying kernel starts. This patch changes the video mode back to a
> text mode before launching the kernel allowing the display to properly
> render for those apps that don't set the display mode before writing: 
> 

A better patch for this should already be in 3.52.

	-hpa