Adam Jackson 486fd4145a exaGetPixmapFirstPixel: avoid framebuffer readbacks if possible.
If the pixel in framebuffer memory isn't modified since we uploaded it, we
can just read from the system memory copy, wihch avoids both a readback and
an accelerator stall.

In principle this function is still wrong, and all the framebuffer pixel
access should be going through (w)fb so we can get pixel layout corrections.
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