[AD] This time GFX_SAFE for real

[Grzegorz Adam Hankiewicz <gradha@xxxxxxxxxx>]

Hi.

Here's a patch for the linux framebuffer. It's essentially the same thing
I posted previously (but this should get applied ;). The differences are
that it's a little bit cleaner, and I also patched exhello, grabber and
the documentation to reflect the GFX_SAFE behaviour and show the purpose
(it's really nice to get grabber and test work in 1024x768 without
ordering it explicitly).

If nobody argues against this change, I will continue to retouch Allegro's
examples and programs using GFX_SAFE to work on any color depth, because
most of them make the assumption that 8 bpp will be set.

 Grzegorz Adam Hankiewicz   gradha@xxxxxxxxxx - http://gradha.infierno.org
 Other web pages:  http://glub.ehu.es/  -  http://welcome.to/gogosoftware/

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