[PATCH] glamor: Wire alpha to 1 for pictures without alpha bits

[Keith Packard]

When sourcing a picture that has no alpha values, make sure any
texture fetches wire the alpha value to one. This ensures that bits
beyond the depth of the pixmap, or bits other than the RGB values
aren't used.
    
Here's the actual patch:

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And here's a test case:

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-- 
keith.packard at intel.com
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