r200/radeon intensity/luminance/alpha formats

[Roland Scheidegger]

I've converted the r200 and radeon driver to use I8 internal format for 
GL_INTENSITY, GL_LUMINANCE and GL_ALPHA formats (so that bug with 
conversion to GL_LUMINANCE_ALPHA wouldn't get triggered in the first 
place now...), the textures are stored by mesa in mesa_texformat_i8, 
-l8, and -a8 respectively.
I think this is the correct thing to do, but if it isn't just complain. 
At least it passes glean (texEnv) on r200, the change is completely 
untested on radeon.
R200 driver now even passes glean texCombine with 4 texture units, yay!

Roland
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