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Based on Adam Jackson's shadow framebuffer fixes in xf86-video-vesa.

Add a couple of items while we're at it.

    #5460 (Kevin Martin), and apply fix for miext/shadow crasher
    https://bugs.freedesktop.org/show_bug.cgi?id=6940 (Kristian Hoegsberg).

    permissions when no access to HW registers is required. For API changes
    which mostly involve the modifications to make the RRFunc (introduced
    with 6.8) more flexible please check Bugzilla #2407. NOTE: This patch
    applies changes to OS specific files for other OSes which I cannot
    test.

    list, so the loader knows not to complain about unresolved symbols when
    an optional module isn't loaded. This typically manifests as warnings
    about fbdevHW symbols when the user isn't using the framebuffer
    console.

    DoLoadableServer NO builds work again.

    coffee yet this morning...

*Weak() resolver functions.

    framebuffer formats except cfb and the overlay modes should work, and
    r128 and radeon need to be loaded from the ati driver (both issues to
    be fixed soon). Tested on i740, s3virge, mach64, tdfx, vesa, and vga
    drivers. elfloader users shouldn't be affected.