r300g: fix warnings

src/gallium/drivers/r300/r300_context.c

@@ -36,8 +36,8 @@
 #include "r300_screen.h"
 #include "r300_state_derived.h"
 #include "r300_state_invariant.h"
-
-#include "radeon_winsys.h"
+#include "r300_texture.h"
+#include "r300_winsys.h"
 
 static enum pipe_error r300_clear_hash_table(void* key, void* value,
                                              void* data)

src/gallium/drivers/r300/r300_winsys.h

@@ -35,6 +35,8 @@ extern "C" {
 #include "pipe/p_state.h"
 #include "pipe/internal/p_winsys_screen.h"
 
+#include "radeon_winsys.h"
+
 struct pipe_context* r300_create_context(struct pipe_screen* screen,
                                          struct radeon_winsys* radeon_winsys);
 

src/gallium/winsys/drm/radeon/core/radeon_buffer.c

@@ -35,7 +35,9 @@
 #include "radeon_bo_gem.h"
 #include "softpipe/sp_texture.h"
 #include "r300_context.h"
+#include "util/u_math.h"
 #include <X11/Xutil.h>
+
 struct radeon_vl_context
 {
     Display *display;