r300: Further reduced the diff between radeon_span.[ch].

src/mesa/drivers/dri/r300/radeon_span.c

@@ -40,9 +40,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  */
 
-#include <unistd.h>
 #include "glheader.h"
-#include "imports.h"
 #include "swrast/swrast.h"
 
 #include "r300_state.h"

src/mesa/drivers/dri/radeon/radeon_span.c

@@ -179,6 +179,9 @@ radeon_mba_z16(const driRenderbuffer * drb, GLint x, GLint y)
 #include "depthtmp.h"
 
 /* 24 bit depth, 8 bit stencil depthbuffer functions
+ *
+ * Careful: It looks like the R300 uses ZZZS byte order while the R200
+ * uses SZZZ for 24 bit depth, 8 bit stencil mode.
  */
 #define WRITE_DEPTH( _x, _y, d )					\
 do {									\