BGRA PIXEL FORMATS CONFORMANCE
Jon Leech, SGI (ljp@engr.sgi.com)

Coverage:
	Add BGRA to list of pixel formats tested.

Conformance:
	Add BGRA to the list of formats tested in drawpix.c.

** drawpix.c
** DrawPixels Test.
**
** Description -
**    Draws a rectangle in the lower left hand corner of the
**    window using glDrawPixels() for every pixel format and type
**    allowed. If the pixel format is one which draws to a color
**    buffer, then a solid rectangle appears. For alpha, stencil
**    and depth formats, values are set so that when a rectangle
**    is drawn, only half of the rectangle should pass the
**    {alpha, stencil, depth} test.
**
**    Rectangles are drawn with fully saturated colors. The
**    outcome of each glDrawPixels() is checked by examining one
**    pixel in the interior of the upper half of the rectangle,
**    and one in the lower half. The results should either be
**    the color set in the initial data or the background color,
**    for the non-passing sections of rectangles in alpha,
**    stencil and depth tests.