vbo: remove unneeded #includes in vbo_context.c

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

src/mesa/vbo/vbo_context.c

@@ -25,9 +25,7 @@
  *    Keith Whitwell <keithw@vmware.com>
  */
 
-#include "main/imports.h"
 #include "main/mtypes.h"
-#include "main/api_arrayelt.h"
 #include "main/bufferobj.h"
 #include "math/m_eval.h"
 #include "vbo.h"