swrast: Clean up header file inclusion in ss_vb.h.
diff --git a/src/mesa/swrast_setup/ss_vb.h b/src/mesa/swrast_setup/ss_vb.h
index b8322f3..05e665b 100644
--- a/src/mesa/swrast_setup/ss_vb.h
+++ b/src/mesa/swrast_setup/ss_vb.h
@@ -29,7 +29,7 @@
 #ifndef SS_VB_H
 #define SS_VB_H
 
-#include "main/mtypes.h"
+struct gl_context;
 
 void _swsetup_vb_init( struct gl_context *ctx );
 void _swsetup_choose_rastersetup_func( struct gl_context *ctx );