gallium: change surface_copy()'s do_flip to boolean

src/gallium/drivers/cell/ppu/cell_surface.c

 
 static void
 cell_surface_copy(struct pipe_context *pipe,
-                  unsigned do_flip,
+                  boolean do_flip,
                   struct pipe_surface *dst,
                   unsigned dstx, unsigned dsty,
                   struct pipe_surface *src,

src/gallium/drivers/i915simple/i915_surface.c

  */
 static void
 i915_surface_copy(struct pipe_context *pipe,
-                  unsigned do_flip,
+                  boolean do_flip,
 		  struct pipe_surface *dst,
 		  unsigned dstx, unsigned dsty,
 		  struct pipe_surface *src,

src/gallium/drivers/i965simple/brw_surface.c

  */
 static void
 brw_surface_copy(struct pipe_context *pipe,
-                 unsigned do_flip,
+                 boolean do_flip,
                  struct pipe_surface *dst,
                  unsigned dstx, unsigned dsty,
                  struct pipe_surface *src,

src/gallium/drivers/softpipe/sp_surface.c

  */
 static void
 sp_surface_copy(struct pipe_context *pipe,
-                unsigned do_flip,
+                boolean do_flip,
 		struct pipe_surface *dst,
 		unsigned dstx, unsigned dsty,
 		struct pipe_surface *src,

src/gallium/include/pipe/p_context.h

     */
    /*@{*/
    void (*surface_copy)(struct pipe_context *pipe,
-                        unsigned do_flip,	/*<< flip surface contents vertically */
+                        boolean do_flip,/**< flip surface contents vertically */
 			struct pipe_surface *dest,
 			unsigned destx, unsigned desty,
 			struct pipe_surface *src, /* don't make this const -