Add a missing header file.


git-svn-id: svn://svn.valgrind.org/vex/trunk@3048 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/ir_match.h b/priv/ir_match.h
index 541845b..6900fa7 100644
--- a/priv/ir_match.h
+++ b/priv/ir_match.h
@@ -40,7 +40,7 @@
 
 #include "libvex_basictypes.h"
 #include "libvex_ir.h"
-
+#include "main_util.h"          // NULL
 
 /* Patterns are simply IRExpr* trees, with IRExpr_Binder nodes at the
    leaves, indicating binding points.  Use these magic macros to
@@ -83,8 +83,6 @@
 
 #endif /* ndef __VEX_IR_MATCH_H */
 
-
-
 /*---------------------------------------------------------------*/
 /*--- end                                          ir_match.h ---*/
 /*---------------------------------------------------------------*/