Specify an explicit window size in builtin uniform tests.
Currently, these tests assume a 250x250 window size, but don't specify SIZE 250x250, which means they can break when using PIGLIT_DEFAULT_SIZE. The tests draw multiple 4x4 rectangles side by side, and lay them out based on the window size. We bump the window width to 256 so that it's a multiple of 4, and shrink y to fit the number of rows. Reviewed-by: Lionel Landwerlin <firstname.lastname@example.org>
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