st/mesa: Remove unnecessary headers from st_cb_texture.c.

src/mesa/state_tracker/st_cb_texture.c

@@ -36,10 +36,8 @@
 #include "main/imports.h"
 #include "main/macros.h"
 #include "main/mipmap.h"
-#include "main/pixel.h"
 #include "main/texcompress.h"
 #include "main/texfetch.h"
-#include "main/texformat.h"
 #include "main/texgetimage.h"
 #include "main/teximage.h"
 #include "main/texobj.h"