gallium/tgsi: move tgsi_exec.h header out of draw_context.h

It gets annoying that changing the tgsi exec rebuilds the state
tracker unnecessarily. Putting this include into draw_gs.h which
uses it causes a lot less rebuilds.

Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/gallium/auxiliary/draw/draw_context.h

@@ -39,7 +39,6 @@
 
 
 #include "pipe/p_state.h"
-#include "tgsi/tgsi_exec.h"
 
 struct pipe_context;
 struct draw_context;

src/gallium/auxiliary/draw/draw_gs.h

@@ -29,6 +29,7 @@
 #define DRAW_GS_H
 
 #include "draw_context.h"
+#include "tgsi/tgsi_exec.h"
 #include "draw_private.h"
 
 #define MAX_TGSI_PRIMITIVES 4